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  1. Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
  2. at java.base/java.util.Objects.requireNonNull(Objects.java:222)
  3. at java.base/java.util.ImmutableCollections$AbstractImmutableList.indexOf(ImmutableCollections.java:166)
  4. at javafx.base/com.sun.javafx.collections.ObservableListWrapper.indexOf(ObservableListWrapper.java:124)
  5. at javafx.controls/javafx.scene.control.ComboBox.lambda$new$1(ComboBox.java:245)
  6. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:360)
  7. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  8. at javafx.base/javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:106)
  9. at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
  10. at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
  11. at javafx.controls/javafx.scene.control.ComboBoxBase.setValue(ComboBoxBase.java:151)
  12. at javafx.controls/javafx.scene.control.ComboBox.updateValue(ComboBox.java:516)
  13. at javafx.controls/javafx.scene.control.ComboBox$3.changed(ComboBox.java:499)
  14. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:360)
  15. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  16. at javafx.base/javafx.beans.property.ReadOnlyObjectPropertyBase.fireValueChangedEvent(ReadOnlyObjectPropertyBase.java:74)
  17. at javafx.base/javafx.beans.property.ReadOnlyObjectWrapper.fireValueChangedEvent(ReadOnlyObjectWrapper.java:102)
  18. at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
  19. at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
  20. at javafx.controls/javafx.scene.control.SelectionModel.setSelectedItem(SelectionModel.java:105)
  21. at javafx.controls/javafx.scene.control.ComboBox$ComboBoxSelectionModel.lambda$new$0(ComboBox.java:556)
  22. at javafx.base/com.sun.javafx.binding.ExpressionHelper$SingleInvalidation.fireValueChangedEvent(ExpressionHelper.java:136)
  23. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  24. at javafx.base/javafx.beans.property.ReadOnlyIntegerPropertyBase.fireValueChangedEvent(ReadOnlyIntegerPropertyBase.java:72)
  25. at javafx.base/javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:102)
  26. at javafx.base/javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:114)
  27. at javafx.base/javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:148)
  28. at javafx.controls/javafx.scene.control.SelectionModel.setSelectedIndex(SelectionModel.java:69)
  29. at javafx.controls/javafx.scene.control.SingleSelectionModel.updateSelectedIndex(SingleSelectionModel.java:215)
  30. at javafx.controls/javafx.scene.control.SingleSelectionModel.clearSelection(SingleSelectionModel.java:68)
  31. at javafx.controls/javafx.scene.control.SingleSelectionModel.select(SingleSelectionModel.java:144)
  32. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.lambda$createListView$10(ComboBoxListViewSkin.java:554)
  33. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:348)
  34. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  35. at javafx.base/javafx.beans.property.ReadOnlyIntegerPropertyBase.fireValueChangedEvent(ReadOnlyIntegerPropertyBase.java:72)
  36. at javafx.base/javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:102)
  37. at javafx.base/javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:114)
  38. at javafx.base/javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:148)
  39. at javafx.controls/javafx.scene.control.SelectionModel.setSelectedIndex(SelectionModel.java:69)
  40. at javafx.controls/javafx.scene.control.MultipleSelectionModelBase.clearSelection(MultipleSelectionModelBase.java:562)
  41. at javafx.controls/javafx.scene.control.ListView$ListViewBitSetSelectionModel.updateDefaultSelection(ListView.java:1532)
  42. at javafx.controls/javafx.scene.control.ListView$ListViewBitSetSelectionModel.updateItemsObserver(ListView.java:1510)
  43. at javafx.controls/javafx.scene.control.ListView$ListViewBitSetSelectionModel$1.invalidated(ListView.java:1242)
  44. at javafx.base/javafx.beans.WeakInvalidationListener.invalidated(WeakInvalidationListener.java:83)
  45. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:348)
  46. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  47. at javafx.base/javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:106)
  48. at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
  49. at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
  50. at javafx.controls/javafx.scene.control.ListView.setItems(ListView.java:394)
  51. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.updateListViewItems(ComboBoxListViewSkin.java:387)
  52. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.lambda$new$0(ComboBoxListViewSkin.java:149)
  53. at javafx.base/javafx.beans.WeakInvalidationListener.invalidated(WeakInvalidationListener.java:83)
  54. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:348)
  55. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  56. at javafx.base/javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:106)
  57. at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
  58. at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
  59. at javafx.controls/javafx.scene.control.ComboBox.setItems(ComboBox.java:306)
  60. at nl.hva.practicumopdracht/practicumopdracht.controllers.AchievementController.refreshData(AchievementController.java:47)
  61. at nl.hva.practicumopdracht/practicumopdracht.controllers.AchievementController.handleAddButton(AchievementController.java:125)
  62. at nl.hva.practicumopdracht/practicumopdracht.controllers.AchievementController.lambda$new$1(AchievementController.java:31)
  63. at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
  64. at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  65. at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  66. at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  67. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  68. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  69. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  70. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  71. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  72. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  73. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  74. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  75. at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  76. at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
  77. at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
  78. at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8890)
  79. at javafx.controls/javafx.scene.control.Button.fire(Button.java:203)
  80. at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
  81. at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
  82. at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
  83. at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
  84. at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  85. at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  86. at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  87. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  88. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  89. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  90. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  91. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  92. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  93. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  94. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  95. at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  96. at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
  97. at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
  98. at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3862)
  99. at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849)
  100. at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2590)
  101. at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:409)
  102. at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:299)
  103. at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
  104. at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:447)
  105. at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412)
  106. at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:446)
  107. at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
  108. at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
  109. at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
  110. at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
  111. at java.base/java.lang.Thread.run(Thread.java:830)
  112. Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
  113. at java.base/java.util.Objects.requireNonNull(Objects.java:222)
  114. at java.base/java.util.ImmutableCollections$AbstractImmutableList.indexOf(ImmutableCollections.java:166)
  115. at javafx.base/com.sun.javafx.collections.ObservableListWrapper.indexOf(ObservableListWrapper.java:124)
  116. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.getIndexOfComboBoxValueInItemsList(ComboBoxListViewSkin.java:467)
  117. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.updateDisplayNode(ComboBoxListViewSkin.java:349)
  118. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.getDisplayNode(ComboBoxListViewSkin.java:266)
  119. at javafx.controls/javafx.scene.control.skin.ComboBoxBaseSkin.updateDisplayArea(ComboBoxBaseSkin.java:289)
  120. at javafx.controls/javafx.scene.control.skin.ComboBoxBaseSkin.lambda$new$7(ComboBoxBaseSkin.java:133)
  121. at java.base/java.util.function.Consumer.lambda$andThen$0(Consumer.java:65)
  122. at javafx.controls/com.sun.javafx.scene.control.LambdaMultiplePropertyChangeListenerHandler.lambda$new$1(LambdaMultiplePropertyChangeListenerHandler.java:49)
  123. at javafx.base/javafx.beans.value.WeakChangeListener.changed(WeakChangeListener.java:86)
  124. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:360)
  125. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  126. at javafx.base/javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:106)
  127. at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
  128. at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
  129. at javafx.controls/javafx.scene.control.ComboBoxBase.setValue(ComboBoxBase.java:151)
  130. at javafx.controls/javafx.scene.control.ComboBox.updateValue(ComboBox.java:516)
  131. at javafx.controls/javafx.scene.control.ComboBox$3.changed(ComboBox.java:499)
  132. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:360)
  133. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  134. at javafx.base/javafx.beans.property.ReadOnlyObjectPropertyBase.fireValueChangedEvent(ReadOnlyObjectPropertyBase.java:74)
  135. at javafx.base/javafx.beans.property.ReadOnlyObjectWrapper.fireValueChangedEvent(ReadOnlyObjectWrapper.java:102)
  136. at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
  137. at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
  138. at javafx.controls/javafx.scene.control.SelectionModel.setSelectedItem(SelectionModel.java:105)
  139. at javafx.controls/javafx.scene.control.ComboBox$ComboBoxSelectionModel.lambda$new$0(ComboBox.java:556)
  140. at javafx.base/com.sun.javafx.binding.ExpressionHelper$SingleInvalidation.fireValueChangedEvent(ExpressionHelper.java:136)
  141. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  142. at javafx.base/javafx.beans.property.ReadOnlyIntegerPropertyBase.fireValueChangedEvent(ReadOnlyIntegerPropertyBase.java:72)
  143. at javafx.base/javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:102)
  144. at javafx.base/javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:114)
  145. at javafx.base/javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:148)
  146. at javafx.controls/javafx.scene.control.SelectionModel.setSelectedIndex(SelectionModel.java:69)
  147. at javafx.controls/javafx.scene.control.SingleSelectionModel.updateSelectedIndex(SingleSelectionModel.java:215)
  148. at javafx.controls/javafx.scene.control.SingleSelectionModel.clearSelection(SingleSelectionModel.java:68)
  149. at javafx.controls/javafx.scene.control.SingleSelectionModel.select(SingleSelectionModel.java:144)
  150. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.lambda$createListView$10(ComboBoxListViewSkin.java:554)
  151. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:348)
  152. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  153. at javafx.base/javafx.beans.property.ReadOnlyIntegerPropertyBase.fireValueChangedEvent(ReadOnlyIntegerPropertyBase.java:72)
  154. at javafx.base/javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:102)
  155. at javafx.base/javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:114)
  156. at javafx.base/javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:148)
  157. at javafx.controls/javafx.scene.control.SelectionModel.setSelectedIndex(SelectionModel.java:69)
  158. at javafx.controls/javafx.scene.control.MultipleSelectionModelBase.clearSelection(MultipleSelectionModelBase.java:562)
  159. at javafx.controls/javafx.scene.control.ListView$ListViewBitSetSelectionModel.updateDefaultSelection(ListView.java:1532)
  160. at javafx.controls/javafx.scene.control.ListView$ListViewBitSetSelectionModel.updateItemsObserver(ListView.java:1510)
  161. at javafx.controls/javafx.scene.control.ListView$ListViewBitSetSelectionModel$1.invalidated(ListView.java:1242)
  162. at javafx.base/javafx.beans.WeakInvalidationListener.invalidated(WeakInvalidationListener.java:83)
  163. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:348)
  164. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  165. at javafx.base/javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:106)
  166. at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
  167. at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
  168. at javafx.controls/javafx.scene.control.ListView.setItems(ListView.java:394)
  169. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.updateListViewItems(ComboBoxListViewSkin.java:387)
  170. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.lambda$new$0(ComboBoxListViewSkin.java:149)
  171. at javafx.base/javafx.beans.WeakInvalidationListener.invalidated(WeakInvalidationListener.java:83)
  172. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:348)
  173. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  174. at javafx.base/javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:106)
  175. at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
  176. at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
  177. at javafx.controls/javafx.scene.control.ComboBox.setItems(ComboBox.java:306)
  178. at nl.hva.practicumopdracht/practicumopdracht.controllers.AchievementController.refreshData(AchievementController.java:47)
  179. at nl.hva.practicumopdracht/practicumopdracht.controllers.AchievementController.handleAddButton(AchievementController.java:125)
  180. at nl.hva.practicumopdracht/practicumopdracht.controllers.AchievementController.lambda$new$1(AchievementController.java:31)
  181. at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
  182. at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  183. at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  184. at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  185. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  186. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  187. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  188. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  189. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  190. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  191. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  192. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  193. at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  194. at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
  195. at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
  196. at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8890)
  197. at javafx.controls/javafx.scene.control.Button.fire(Button.java:203)
  198. at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
  199. at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
  200. at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
  201. at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
  202. at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  203. at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  204. at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  205. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  206. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  207. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  208. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  209. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  210. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  211. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  212. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  213. at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  214. at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
  215. at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
  216. at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3862)
  217. at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849)
  218. at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2590)
  219. at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:409)
  220. at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:299)
  221. at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
  222. at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:447)
  223. at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412)
  224. at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:446)
  225. at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
  226. at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
  227. at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
  228. at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
  229. at java.base/java.lang.Thread.run(Thread.java:830)
  230. Exception in thread "JavaFX Application Thread" java.lang.NullPointerException
  231. at java.base/java.util.Objects.requireNonNull(Objects.java:222)
  232. at java.base/java.util.ImmutableCollections$AbstractImmutableList.indexOf(ImmutableCollections.java:166)
  233. at javafx.base/com.sun.javafx.collections.ObservableListWrapper.indexOf(ObservableListWrapper.java:124)
  234. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.getIndexOfComboBoxValueInItemsList(ComboBoxListViewSkin.java:467)
  235. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.updateDisplayNode(ComboBoxListViewSkin.java:349)
  236. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.lambda$createListView$10(ComboBoxListViewSkin.java:555)
  237. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:348)
  238. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  239. at javafx.base/javafx.beans.property.ReadOnlyIntegerPropertyBase.fireValueChangedEvent(ReadOnlyIntegerPropertyBase.java:72)
  240. at javafx.base/javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(ReadOnlyIntegerWrapper.java:102)
  241. at javafx.base/javafx.beans.property.IntegerPropertyBase.markInvalid(IntegerPropertyBase.java:114)
  242. at javafx.base/javafx.beans.property.IntegerPropertyBase.set(IntegerPropertyBase.java:148)
  243. at javafx.controls/javafx.scene.control.SelectionModel.setSelectedIndex(SelectionModel.java:69)
  244. at javafx.controls/javafx.scene.control.MultipleSelectionModelBase.clearSelection(MultipleSelectionModelBase.java:562)
  245. at javafx.controls/javafx.scene.control.ListView$ListViewBitSetSelectionModel.updateDefaultSelection(ListView.java:1532)
  246. at javafx.controls/javafx.scene.control.ListView$ListViewBitSetSelectionModel.updateItemsObserver(ListView.java:1510)
  247. at javafx.controls/javafx.scene.control.ListView$ListViewBitSetSelectionModel$1.invalidated(ListView.java:1242)
  248. at javafx.base/javafx.beans.WeakInvalidationListener.invalidated(WeakInvalidationListener.java:83)
  249. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:348)
  250. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  251. at javafx.base/javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:106)
  252. at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
  253. at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
  254. at javafx.controls/javafx.scene.control.ListView.setItems(ListView.java:394)
  255. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.updateListViewItems(ComboBoxListViewSkin.java:387)
  256. at javafx.controls/javafx.scene.control.skin.ComboBoxListViewSkin.lambda$new$0(ComboBoxListViewSkin.java:149)
  257. at javafx.base/javafx.beans.WeakInvalidationListener.invalidated(WeakInvalidationListener.java:83)
  258. at javafx.base/com.sun.javafx.binding.ExpressionHelper$Generic.fireValueChangedEvent(ExpressionHelper.java:348)
  259. at javafx.base/com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(ExpressionHelper.java:80)
  260. at javafx.base/javafx.beans.property.ObjectPropertyBase.fireValueChangedEvent(ObjectPropertyBase.java:106)
  261. at javafx.base/javafx.beans.property.ObjectPropertyBase.markInvalid(ObjectPropertyBase.java:113)
  262. at javafx.base/javafx.beans.property.ObjectPropertyBase.set(ObjectPropertyBase.java:147)
  263. at javafx.controls/javafx.scene.control.ComboBox.setItems(ComboBox.java:306)
  264. at nl.hva.practicumopdracht/practicumopdracht.controllers.AchievementController.refreshData(AchievementController.java:47)
  265. at nl.hva.practicumopdracht/practicumopdracht.controllers.AchievementController.handleAddButton(AchievementController.java:125)
  266. at nl.hva.practicumopdracht/practicumopdracht.controllers.AchievementController.lambda$new$1(AchievementController.java:31)
  267. at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:86)
  268. at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  269. at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  270. at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  271. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  272. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  273. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  274. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  275. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  276. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  277. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  278. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  279. at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  280. at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:49)
  281. at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
  282. at javafx.graphics/javafx.scene.Node.fireEvent(Node.java:8890)
  283. at javafx.controls/javafx.scene.control.Button.fire(Button.java:203)
  284. at javafx.controls/com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java:206)
  285. at javafx.controls/com.sun.javafx.scene.control.inputmap.InputMap.handle(InputMap.java:274)
  286. at javafx.base/com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java:218)
  287. at javafx.base/com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java:80)
  288. at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:238)
  289. at javafx.base/com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java:191)
  290. at javafx.base/com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java:59)
  291. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:58)
  292. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  293. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  294. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  295. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  296. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  297. at javafx.base/com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java:56)
  298. at javafx.base/com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java:114)
  299. at javafx.base/com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java:74)
  300. at javafx.base/com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java:54)
  301. at javafx.base/javafx.event.Event.fireEvent(Event.java:198)
  302. at javafx.graphics/javafx.scene.Scene$MouseHandler.process(Scene.java:3862)
  303. at javafx.graphics/javafx.scene.Scene.processMouseEvent(Scene.java:1849)
  304. at javafx.graphics/javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java:2590)
  305. at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:409)
  306. at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run(GlassViewEventHandler.java:299)
  307. at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
  308. at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$2(GlassViewEventHandler.java:447)
  309. at javafx.graphics/com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412)
  310. at javafx.graphics/com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewEventHandler.java:446)
  311. at javafx.graphics/com.sun.glass.ui.View.handleMouseEvent(View.java:556)
  312. at javafx.graphics/com.sun.glass.ui.View.notifyMouse(View.java:942)
  313. at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
  314. at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
  315. at java.base/java.lang.Thread.run(Thread.java:830)
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