---- Minecraft Crash Report ----
// Don't be sad. I'll do better next time, I promise!

Time: 7/31/14 2:12 PM
Description: Exception in server tick loop

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:806)
	at java.util.HashMap$KeyIterator.next(HashMap.java:841)
	at qi.a(SourceFile:163)
	at net.minecraft.server.MinecraftServer.y(SourceFile:614)
	at pk.y(SourceFile:303)
	at net.minecraft.server.MinecraftServer.x(SourceFile:530)
	at net.minecraft.server.MinecraftServer.run(SourceFile:446)
	at java.lang.Thread.run(Thread.java:722)


A detailed walkthrough of the error, its code path and all known details is as follows:
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-- System Details --
Details:
	Minecraft Version: 14w31a
	Operating System: Linux (amd64) version 2.6.32-431.11.2.el6.centos.plus.x86_64
	Java Version: 1.7.0, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 5055126592 bytes (4820 MB) / 5786894336 bytes (5518 MB) up to 5786894336 bytes (5518 MB)
	JVM Flags: 2 total; -Xms6G -Xmx6G
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Player Count: 9 / 64; [qr['PewPewzEC'/217, l='earth', x=-221.30, y=63.00, z=543.70], qr['Piipniip'/8889, l='earth', x=314.64, y=67.00, z=92.71], qr['vectormasterxd'/19777, l='earth', x=125.18, y=12.00, z=111.85], qr['nearby_nation'/23078, l='earth', x=385.90, y=61.00, z=8733.86], qr['jangelsan'/50397, l='earth', x=9380.52, y=67.00, z=8307.67], qr['jdlfcgamer'/50621, l='earth', x=-758.89, y=71.00, z=1698.30], qr['MrBoogie21'/59105, l='earth', x=248.75, y=51.00, z=563.08], qr['abelrex'/61740, l='earth', x=119.47, y=11.00, z=119.36], qr['Assassin6622'/61754, l='earth', x=-135.70, y=12.00, z=725.31]]
	Is Modded: Unknown (can't tell)
	Type: Dedicated Server (map_server.txt)