java.lang.NullPointerException: Unexpected error

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java.lang.NullPointerException: Unexpected error
at com.bymarcin.zettaindustries.mods.battery.erogenousbeef.core.multiblock.MultiblockTileEntityBase.getNeighboringParts(MultiblockTileEntityBase.java:317)
at com.bymarcin.zettaindustries.mods.battery.erogenousbeef.core.multiblock.MultiblockTileEntityBase.attachToNeighbors(MultiblockTileEntityBase.java:48)
at com.bymarcin.zettaindustries.mods.battery.erogenousbeef.core.multiblock.MultiblockWorldRegistry.processMultiblockChanges(MultiblockWorldRegistry.java:132)
at com.bymarcin.zettaindustries.mods.battery.erogenousbeef.core.multiblock.MultiblockRegistry.tickStart(MultiblockRegistry.java:25)
at com.bymarcin.zettaindustries.mods.battery.erogenousbeef.core.multiblock.MultiblockClientTickHandler.onClientTick(MultiblockClientTickHandler.java:12)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_492_MultiblockClientTickHandler_onClientTick_ClientTickEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:72)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:168)
at net.minecraft.client.Minecraft.func_71407_l(Minecraft.java:1650)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:1055)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:371)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)

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