net.minecraft.server.v1_11_R1.ReportedException: Ticking player


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Ticking player

Stack trace

net.minecraft.server.v1_11_R1.ReportedException: Ticking player
	at net.minecraft.server.v1_11_R1.EntityPlayer.playerTick(EntityPlayer.java:366)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.PlayerConnection.F_(PlayerConnection.java:139)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.NetworkManager.a(NetworkManager.java:239)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.ServerConnection.c(ServerConnection.java:150)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.MinecraftServer.D(MinecraftServer.java:916)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.DedicatedServer.D(DedicatedServer.java:403)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.MinecraftServer.C(MinecraftServer.java:749)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.MinecraftServer.run(MinecraftServer.java:648)[patched_1.11.2.jar:git-Paper-1020]
	at java.lang.Thread.run(Thread.java:745)[?:1.8.0_91]
Caused by: java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)[?:1.8.0_91]
	at java.util.HashMap$KeyIterator.next(HashMap.java:1453)[?:1.8.0_91]
	at net.minecraft.server.v1_11_R1.NBTTagCompound.g(NBTTagCompound.java:358)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.NBTTagCompound.clone(NBTTagCompound.java:435)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.NBTTagCompound.g(NBTTagCompound.java:360)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.ItemStack.cloneItemStack(ItemStack.java:468)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.PacketPlayOutEntityEquipment.<init>(SourceFile:21)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.EntityLiving.A_(EntityLiving.java:1882)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.EntityHuman.A_(EntityHuman.java:143)[patched_1.11.2.jar:git-Paper-1020]
	at net.minecraft.server.v1_11_R1.EntityPlayer.playerTick(EntityPlayer.java:285)[patched_1.11.2.jar:git-Paper-1020]
	... 8 more

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