---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 31-3-13 16:45
Description: Exception ticking world

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
	at java.util.HashMap$KeyIterator.next(Unknown Source)
	at iy.b(SourceFile:196)
	at iz.b(SourceFile:122)
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at hz.r(SourceFile:255)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)


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 iy.b(SourceFile:196)
	at iz.b(SourceFile:122)

-- Affected level --
Details:
	Level name: multi-island
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 1045 Drop: 420
	Level seed: 5347584679780283922
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-2616,75,-1184), Chunk: (at 8,4,0 in -164,-74; contains blocks -2624,0,-1184 to -2609,255,-1169), Region: (-6,-3; contains chunks -192,-96 to -161,-65, blocks -3072,0,-1536 to -2561,255,-1025)
	Level time: 33898833 game time, 1673874 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 154692 (now: false), thunder time: 158239 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at hz.r(SourceFile:255)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)

-- System Details --
Details:
	Minecraft Version: 1.5.1
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_15, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 974153976 bytes (929 MB) / 1072300032 bytes (1022 MB) up to 1072300032 bytes (1022 MB)
	JVM Flags: 2 total; -Xms1024m -Xmx1024m
	AABB Pool Size: 5157 (288792 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 63
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 1722 (96432 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 0 / 10; []
	Is Modded: Unknown (can't tell)
	Type: Dedicated Server (map_server.txt)