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java.util.ConcurrentModificationException: 	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)	at java.util.HashMap$KeyIterator.next(HashMap.java:1453)	at net.minecraft.server.v1_11_R1.NBTTagCompound.g(NBTTagCompound.java:358)	at net.minecraft.server.v1_11_R1.NBTTagCompound.clone(NBTTagCompound.java:435)	at net.minecraft.server.v1_11_R1.NBTTagCompound.g(NBTTagCompound.java:360)	at net.minecraft.server.v1_11_R1.ItemStack.cloneItemStack(ItemStack.java:468)	at net.minecraft.server.v1_11_R1.PacketPlayOutEntityEquipment.(SourceFile:21)	at net.minecraft.server.v1_11_R1.EntityLiving.A_(EntityLiving.java:1882)	at net.minecraft.server.v1_11_R1.EntityHuman.A_(EntityHuman.java:143)	at net.minecraft.server.v1_11_R1.EntityPlayer.playerTick(EntityPlayer.java:285)	at net.minecraft.server.v1_11_R1.PlayerConnection.F_(PlayerConnection.java:139)	at net.minecraft.server.v1_11_R1.NetworkManager.a(NetworkManager.java:239)	at net.minecraft.server.v1_11_R1.ServerConnection.c(ServerConnection.java:150)	at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:916)	at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:403)	at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:749)	at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:648)	at java.lang.Thread.run(Thread.java:745)