[00:24:42] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer]: 1456200/1726596 Chunks <Average/t: 5> Ram: 4129MB
[00:24:43] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer]: 1456300/1726596 Chunks <Average/t: 5,3> Ram: 4123MB
[00:24:45] [File IO Thread/ERROR] [net.minecraft.world.chunk.storage.AnvilChunkLoader]: Failed to save chunk
java.util.ConcurrentModificationException: null
	at java.util.HashMap$HashIterator.nextNode(Unknown Source) ~[?:1.8.0_241]
	at java.util.HashMap$KeyIterator.next(Unknown Source) ~[?:1.8.0_241]
	at net.minecraft.nbt.NBTTagCompound.func_74734_a(NBTTagCompound.java:27) ~[fy.class:?]
	at net.minecraft.nbt.CompressedStreamTools.func_150663_a(CompressedStreamTools.java:112) ~[gi.class:?]
	at net.minecraft.nbt.CompressedStreamTools.func_74800_a(CompressedStreamTools.java:102) ~[gi.class:?]
	at net.minecraft.world.chunk.storage.RegionFileCache.getChunkOutputStream(RegionFileCache.java:139) ~[ayk.class:?]
	at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_183013_b(AnvilChunkLoader.java:244) ~[aye.class:?]
	at net.minecraft.world.chunk.storage.AnvilChunkLoader.func_75814_c(AnvilChunkLoader.java:220) [aye.class:?]
	at net.minecraft.world.storage.ThreadedFileIOBase.func_75736_b(SourceFile:37) [bgx.class:?]
	at net.minecraft.world.storage.ThreadedFileIOBase.run(SourceFile:30) [bgx.class:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_241]
[00:24:46] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer]: 1456400/1726596 Chunks <Average/t: 5,3> Ram: 4114MB
[00:24:48] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer]: 1456500/1726596 Chunks <Average/t: 5,3> Ram: 4119MB
[00:24:51] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer]: 1456600/1726596 Chunks <Average/t: 5,2> Ram: 4137MB
[00:24:54] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer]: 1456700/1726596 Chunks <Average/t: 5,2> Ram: 4128MB
[00:24:56] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer]: 1456800/1726596 Chunks <Average/t: 5,1> Ram: 4152MB
[00:24:58] [Server thread/INFO] [net.minecraft.server.dedicated.DedicatedServer]: 1456900/1726596 Chunks <Average/t: 5,2> Ram: 4152MB