java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.HashMap$HashIterator.nextNode(HashMap.java:1437)
at cn.lambdalib.util.datapart.EntityData.tick(EntityData.java:209)
at cn.lambdalib.util.datapart.EntityData.access$000(EntityData.java:34)
at cn.lambdalib.util.datapart.EntityData$EventListener.onLivingUpdate(EntityData.java:223)
at cpw.mods.fml.common.eventhandler.ASMEventHandler_379_EventListener_onLivingUpdate_LivingUpdateEvent.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.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:1846)
at net.minecraft.entity.player.EntityPlayer.func_70071_h_(Unknown Source)
at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:393)
at net.minecraft.network.NetHandlerPlayServer.func_147347_a(NetHandlerPlayServer.java:482)
at net.minecraft.network.play.client.C03PacketPlayer.func_148833_a(C03PacketPlayer.java:36)
at net.minecraft.network.play.client.C03PacketPlayer.func_148833_a(C03PacketPlayer.java:101)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:245)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:991)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:431)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:809)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:669)
at java.lang.Thread.run(Thread.java:745)

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