Problem Server hang/crash: java.util.concurrentmodificationexception in net.minecraft.nbt.nbttagcompound

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A

Anaerin

New Member
Jul 29, 2019
62
0
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I have no idea what's causing it, but I keep getting:
Code: 
2014-01-29 07:34:55 [INFO] [STDERR] java.util.ConcurrentModificationException
2014-01-29 07:34:55 [INFO] [STDERR]    at java.util.HashMap$HashIterator.nextEntry(HashMap.java:894)
2014-01-29 07:34:55 [INFO] [STDERR]    at java.util.HashMap$ValueIterator.next(HashMap.java:922)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.nbt.NBTTagCompound.func_74734_a(SourceFile:25)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.nbt.NBTBase.func_74731_a(SourceFile:119)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.nbt.NBTTagCompound.func_74734_a(SourceFile:26)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.nbt.NBTBase.func_74731_a(SourceFile:119)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.nbt.NBTTagCompound.func_74734_a(SourceFile:26)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.nbt.NBTTagList.func_74734_a(NBTTagList.java:49)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.nbt.NBTBase.func_74731_a(SourceFile:119)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.nbt.NBTTagCompound.func_74734_a(SourceFile:26)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.nbt.NBTBase.func_74731_a(SourceFile:119)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.nbt.NBTTagCompound.func_74734_a(SourceFile:26)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.nbt.NBTBase.func_74731_a(SourceFile:119)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.nbt.CompressedStreamTools.func_74800_a(CompressedStreamTools.java:140)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75821_a(AnvilChunkLoader.java:198)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75814_c(AnvilChunkLoader.java:184)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.world.storage.ThreadedFileIOBase.func_75736_b(SourceFile:30)
2014-01-29 07:34:55 [INFO] [STDERR]    at net.minecraft.world.storage.ThreadedFileIOBase.run(SourceFile:23)
2014-01-29 07:34:55 [INFO] [STDERR]    at java.lang.Thread.run(Thread.java:724)
At seemingly random times, after the server has been up a while. It usually happens when players are on, but not always, and it causes the server to hang, stuck so badly it won't respond to a "stop" command from the console.

Server stats: Dual-Core, 3.5GB RAM Windows Azure VM running Ubuntu, and hosting only Minecraft.
 
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