[15:26:16 WARN]: java.lang.NullPointerException
[15:26:16 WARN]: 	at io.hotmail.com.jacob_vejvoda.advanced_genetics.advanced_genetics.removeExtractor(advanced_genetics.java:569)
[15:26:16 WARN]: 	at io.hotmail.com.jacob_vejvoda.advanced_genetics.advanced_genetics.onBlockBreak(advanced_genetics.java:552)
[15:26:16 WARN]: 	at sun.reflect.GeneratedMethodAccessor114.invoke(Unknown Source)
[15:26:16 WARN]: 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[15:26:16 WARN]: 	at java.lang.reflect.Method.invoke(Unknown Source)
[15:26:16 WARN]: 	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301)
[15:26:16 WARN]: 	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
[15:26:16 WARN]: 	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)
[15:26:16 WARN]: 	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)
[15:26:16 WARN]: 	at net.minecraft.server.v1_8_R1.PlayerInteractManager.breakBlock(PlayerInteractManager.java:286)
[15:26:16 WARN]: 	at net.minecraft.server.v1_8_R1.PlayerInteractManager.a(PlayerInteractManager.java:121)
[15:26:16 WARN]: 	at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:588)
[15:26:16 WARN]: 	at net.minecraft.server.v1_8_R1.PacketPlayInBlockDig.a(SourceFile:40)
[15:26:16 WARN]: 	at net.minecraft.server.v1_8_R1.PacketPlayInBlockDig.a(SourceFile:10)
[15:26:16 WARN]: 	at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13)
[15:26:16 WARN]: 	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
[15:26:16 WARN]: 	at java.util.concurrent.FutureTask.run(Unknown Source)
[15:26:16 WARN]: 	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:696)
[15:26:16 WARN]: 	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316)
[15:26:16 WARN]: 	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:634)
[15:26:16 WARN]: 	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:537)
[15:26:16 WARN]: 	at java.lang.Thread.run(Unknown Source)