---- Minecraft Crash Report ----
// I'm sorry, Dave.

Time: 3/2/13 7:20 PM
Description: Adding entity to track

java.lang.IllegalStateException: Entity is already tracked!
	at it.a(SourceFile:76)
	at it.a(SourceFile:55)
	at iv.a(SourceFile:24)
	at zv.a(SourceFile:866)
	at iz.a(SourceFile:632)
	at zv.d(SourceFile:858)
	at aah.a(SourceFile:138)
	at iz.b(SourceFile:119)
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at bja.q(SourceFile:122)
	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:
---------------------------------------------------------------------------------------

-- Entity To Track --
Details:
	Tracking range: 64 blocks
	Update interval: Once per 3 ticks
	Entity Type: Squid (ql)
	Entity ID: 121934
	Entity Name: Squid
	Entity's Exact location: 527.50, 59.00, 570.50
	Entity's Block location: World: (527,59,570), Chunk: (at 15,3,10 in 32,35; contains blocks 512,0,560 to 527,255,575), Region: (1,1; contains chunks 32,32 to 63,63, blocks 512,0,512 to 1023,255,1023)
	Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
	at it.a(SourceFile:76)
	at it.a(SourceFile:55)
	at iv.a(SourceFile:24)
	at zv.a(SourceFile:866)
	at iz.a(SourceFile:632)
	at zv.d(SourceFile:858)
	at aah.a(SourceFile:138)
	at iz.b(SourceFile:119)

-- Affected level --
Details:
	Level name: The Best World
	All players: 1 total; [jc['Hunter_K13'/114229, l='The Best World', x=642.50, y=251.00, z=626.54]]
	Chunk stats: ServerChunkCache: 1066 Drop: 0
	Level seed: -976295282
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-128,64,72), Chunk: (at 0,4,8 in -8,4; contains blocks -128,0,64 to -113,255,79), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 3780948 game time, 16211 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 15677 (now: false), thunder time: 15677 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.r(SourceFile:454)
	at net.minecraft.server.MinecraftServer.q(SourceFile:397)
	at bja.q(SourceFile:122)
	at net.minecraft.server.MinecraftServer.run(SourceFile:331)
	at gp.run(SourceFile:573)

-- System Details --
Details:
	Minecraft Version: 13w09c
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_13, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 167136960 bytes (159 MB) / 519110656 bytes (495 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 2 total; -Xms512m -Xmx1024m
	AABB Pool Size: 3870 (216720 bytes; 0 MB) allocated, 58 (3248 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: 3808 (213248 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [jc['Hunter_K13'/114229, l='The Best World', x=642.50, y=251.00, z=626.54]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.