---- Minecraft Crash Report ----
// Don't do that.

Time: 8/10/14 12:44 AM
Description: Exception in server tick loop

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
	at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
	at ql.a(SourceFile:166)
	at net.minecraft.server.MinecraftServer.y(SourceFile:614)
	at pm.y(SourceFile:305)
	at net.minecraft.server.MinecraftServer.x(SourceFile:530)
	at net.minecraft.server.MinecraftServer.run(SourceFile:446)
	at java.lang.Thread.run(Thread.java:745)


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: 14w32d
	Operating System: Mac OS X (x86_64) version 10.9.3
	Java Version: 1.8.0_05, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 1545721296 bytes (1474 MB) / 3113021440 bytes (2968 MB) up to 4225236992 bytes (4029 MB)
	JVM Flags: 7 total; -Xincgc -Xmx4G -XX:+PrintAdaptiveSizePolicy -XX:+PrintGCDetails -Xloggc:server_gc.log -XX:OnError=/Users/steve/Minecraft/Swim3/scripts/jvm_on_error.sh -XX:OnOutOfMemoryError=/Users/steve/Minecraft/Swim3/scripts/jvm_on_out_of_memory.sh
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 98
	Profiler Position: N/A (disabled)
	Player Count: 11 / 20
	Is Modded: Unknown (can't tell)
	Type: Dedicated Server (map_server.txt)