02-12 11:44:45 [SEVERE] [TickThreading] Exception ticking world Overworld/0
java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:839)
	at java.util.HashMap$KeyIterator.next(HashMap.java:874)
	at ic2.core.network.NetworkManager.getFieldData(NetworkManager.java:531)
	at ic2.core.network.NetworkManager.sendUpdatePacket(NetworkManager.java:307)
	at ic2.core.network.NetworkManager.sendUpdatePacket(NetworkManager.java:300)
	at ic2.core.network.NetworkManager.onTick(NetworkManager.java:81)
	at ic2.core.IC2.tickStart(IC2.java:1635)
	at cpw.mods.fml.common.SingleIntervalHandler.tickStart(SingleIntervalHandler.java:25)
	at cpw.mods.fml.common.FMLCommonHandler.tickStart(FMLCommonHandler.java:59)
	at cpw.mods.fml.common.FMLCommonHandler.onPreWorldTick(FMLCommonHandler.java:296)
	at net.minecraft.server.MinecraftServer.doWorldTick(MinecraftServer.java:330)
	at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:240)
	at ho.r(DedicatedServer.java:269)
	at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:176)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:104)
	at fy.run(SourceFile:849)