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

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java.util.ConcurrentModificationException:
at java.util.HashMap$HashIterator.nextNode(Unknown Source)
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_132_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:1560)
at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:288)
at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:295)
at net.minecraft.network.NetHandlerPlayServer.func_147347_a(NetHandlerPlayServer.java:303)
at net.minecraft.network.play.client.C03PacketPlayer.func_148833_a(SourceFile:137)
at net.minecraft.network.play.client.C03PacketPlayer.func_148833_a(SourceFile:8)
at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:111)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)

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