java.lang.NullPointerException: Exception in server tick loop

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java.lang.NullPointerException: Exception in server tick loop
at ic2.core.energy.Grid.merge(Grid.java:227)
at ic2.core.energy.EnergyNetLocal.addTileToGrids(EnergyNetLocal.java:544)
at ic2.core.energy.EnergyNetLocal.addTileEntity(EnergyNetLocal.java:185)
at ic2.core.energy.EnergyNetLocal.addTileEntity(EnergyNetLocal.java:66)
at ic2.core.energy.EventHandler.onEnergyTileLoad(EventHandler.java:28)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_43_EventHandler_onEnergyTileLoad_EnergyTileLoadEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at ic2.core.block.wiring.TileEntityCable.onLoaded(TileEntityCable.java:159)
at ic2.core.block.TileEntityBlock$1.tickCallback(TileEntityBlock.java:60)
at ic2.core.TickHandler.processTickCallbacks(TickHandler.java:175)
at ic2.core.TickHandler.onWorldTick(TickHandler.java:60)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_25_TickHandler_onWorldTick_WorldTickEvent.invoke(.dynamic)
at cpw.mods.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:54)
at cpw.mods.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:957)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:432)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:841)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:693)
at java.lang.Thread.run(Thread.java:745)

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