---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 7/31/14 9:45 PM
Description: Exception in server tick loop

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:926)
	at java.util.HashMap$KeyIterator.next(HashMap.java:960)
	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:744)


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 3.2.0-4-amd64
	Java Version: 1.7.0_55, Oracle Corporation
	Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 1235851896 bytes (1178 MB) / 2119172096 bytes (2021 MB) up to 3817865216 bytes (3641 MB)
	JVM Flags: 2 total; -Xms2G -Xmx4G
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Player Count: 4 / 20; [qr['DrKaffee'/508, l='world', x=-733.93, y=68.00, z=-564.05], qr['Ekahaat'/12802, l='world', x=-742.70, y=72.00, z=-559.95], qr['Elewurst'/20666, l='world', x=-742.42, y=19.00, z=-526.14], qr['Colwin'/91344, l='world', x=-706.37, y=65.00, z=-578.12]]
	Is Modded: Unknown (can't tell)
	Type: Dedicated Server (map_server.txt)