---- Minecraft Crash Report ----
// I blame Dinnerbone.

Time: 19-6-14 11:56
Description: Exception ticking world entities

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(Unknown Source)
	at java.util.HashMap$KeyIterator.next(Unknown Source)
	at oo.b(SourceFile:143)
	at oq.b(SourceFile:38)
	at alu.b(SourceFile:933)
	at ou.b(SourceFile:735)
	at alu.i(SourceFile:1342)
	at ou.i(SourceFile:422)
	at net.minecraft.server.MinecraftServer.w(SourceFile:578)
	at net.minecraft.server.MinecraftServer.v(SourceFile:506)
	at cof.v(SourceFile:132)
	at net.minecraft.server.MinecraftServer.run(SourceFile:422)
	at java.lang.Thread.run(Unknown Source)


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 oo.b(SourceFile:143)
	at oq.b(SourceFile:38)
	at alu.b(SourceFile:933)
	at ou.b(SourceFile:735)
	at alu.i(SourceFile:1342)
	at ou.i(SourceFile:422)

-- Affected level --
Details:
	Level name: 14w25a
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 887 Drop: 5
	Level seed: 250936641669885156
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: -249,00,63,00,-795,00 - World: (-249,63,-795), Chunk: (at 7,3,5 in -16,-50; contains blocks -256,0,-800 to -241,255,-785), Region: (-1,-2; contains chunks -32,-64 to -1,-33, blocks -512,0,-1024 to -1,255,-513)
	Level time: 67433 game time, 67433 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 43184 (now: false), thunder time: 56237 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.w(SourceFile:578)
	at net.minecraft.server.MinecraftServer.v(SourceFile:506)
	at cof.v(SourceFile:132)
	at net.minecraft.server.MinecraftServer.run(SourceFile:422)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 14w25a
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_55, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 320659064 bytes (305 MB) / 449839104 bytes (429 MB) up to 954728448 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [ox['karstvgl'/62, l='14w25a', x=78,47, y=69,00, z=-156,31]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.