[04:26:42 ERROR]: Could not pass event InventoryClickEvent to McRPG v1.0.1-ALPHA
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:309) ~[spigot.jar:git-Spigot-f56e2e7-98b862a]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-Spigot-f56e2e7-98b862a]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:500) ~[spigot.jar:git-Spigot-f56e2e7-98b862a]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:485) ~[spigot.jar:git-Spigot-f56e2e7-98b862a]
        at net.minecraft.server.v1_13_R2.PlayerConnection.a(PlayerConnection.java:2122) ~[spigot.jar:git-Spigot-f56e2e7-98b862a]
        at net.minecraft.server.v1_13_R2.PacketPlayInWindowClick.a(SourceFile:33) ~[spigot.jar:git-Spigot-f56e2e7-98b862a]
        at net.minecraft.server.v1_13_R2.PacketPlayInWindowClick.a(SourceFile:10) ~[spigot.jar:git-Spigot-f56e2e7-98b862a]
        at net.minecraft.server.v1_13_R2.PlayerConnectionUtils.a(SourceFile:10) ~[spigot.jar:git-Spigot-f56e2e7-98b862a]
        at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.8.0_181]
        at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.8.0_181]
        at net.minecraft.server.v1_13_R2.SystemUtils.a(SourceFile:199) [spigot.jar:git-Spigot-f56e2e7-98b862a]
        at net.minecraft.server.v1_13_R2.MinecraftServer.b(MinecraftServer.java:896) [spigot.jar:git-Spigot-f56e2e7-98b862a]
        at net.minecraft.server.v1_13_R2.DedicatedServer.b(DedicatedServer.java:417) [spigot.jar:git-Spigot-f56e2e7-98b862a]
        at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:831) [spigot.jar:git-Spigot-f56e2e7-98b862a]
        at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:729) [spigot.jar:git-Spigot-f56e2e7-98b862a]
        at java.lang.Thread.run(Unknown Source) [?:1.8.0_181]
Caused by: java.lang.NullPointerException
        at us.eunoians.mcrpg.gui.EditDefaultAbilitiesGUI.lambda$new$0(EditDefaultAbilitiesGUI.java:46) ~[McRPG-1.0.1-ALPHA.jar:?]
        at us.eunoians.mcrpg.gui.GUIBuilder.rebuildGUI(GUIBuilder.java:163) ~[McRPG-1.0.1-ALPHA.jar:?]
        at us.eunoians.mcrpg.gui.EditDefaultAbilitiesGUI.<init>(EditDefaultAbilitiesGUI.java:81) ~[McRPG-1.0.1-ALPHA.jar:?]
        at us.eunoians.mcrpg.events.vanilla.InvClickEvent.invClickEvent(InvClickEvent.java:102) ~[McRPG-1.0.1-ALPHA.jar:?]
        at sun.reflect.GeneratedMethodAccessor146.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_181]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_181]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot.jar:git-Spigot-f56e2e7-98b862a]
        ... 15 more