---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~]

Time: 5/4/13 5:45 PM
Description: Exception ticking world

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
	at java.util.HashMap$KeyIterator.next(Unknown Source)
	at aba.a(SourceFile:72)
	at jb.b(SourceFile:121)
	at net.minecraft.server.MinecraftServer.s(SourceFile:464)
	at net.minecraft.server.MinecraftServer.r(SourceFile:407)
	at bha.r(SourceFile:125)
	at net.minecraft.server.MinecraftServer.run(SourceFile:341)
	at gr.run(SourceFile:584)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
	at java.util.HashMap$KeyIterator.next(Unknown Source)
	at aba.a(SourceFile:72)
	at jb.b(SourceFile:121)

-- Affected level --
Details:
	Level name: ?
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 643 Drop: 0
	Level seed: -1681493843108467940
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (120,64,248), Chunk: (at 8,4,8 in 7,15; contains blocks 112,0,240 to 127,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 578364 game time, 23799 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 48803 (now: false), thunder time: 55908 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.s(SourceFile:464)
	at net.minecraft.server.MinecraftServer.r(SourceFile:407)
	at bha.r(SourceFile:125)
	at net.minecraft.server.MinecraftServer.run(SourceFile:341)
	at gr.run(SourceFile:584)

-- System Details --
Details:
	Minecraft Version: 13w18c
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 176958856 bytes (168 MB) / 486637568 bytes (464 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 520938 (29172528 bytes; 27 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 11859 (664104 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.