---- Minecraft Crash Report ----
// Hey, that tickles! Hehehe!

Time: 10-03-13 02:20
Description: Adding entity to track

java.lang.IllegalStateException: Entity is already tracked!
	at it.a(SourceFile:76)
	at it.a(SourceFile:61)
	at iv.a(SourceFile:24)
	at zv.a(SourceFile:867)
	at iz.a(SourceFile:635)
	at zv.d(SourceFile:859)
	at amn.k(SourceFile:55)
	at amn.a(SourceFile:35)
	at iz.a(SourceFile:430)
	at iz.b(SourceFile:142)
	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: 144 blocks
	Update interval: Once per 20 ticks
	Entity Type: FallingSand (ra)
	Entity ID: 55295
	Entity Name: Falling Block
	Entity's Exact location: -273,50, 48,50, 288,50
	Entity's Block location: World: (-274,48,288), Chunk: (at 14,3,0 in -18,18; contains blocks -288,0,288 to -273,255,303), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Entity's Momentum: 0,00, 0,00, 0,00
	Immitating block ID: 13
	Immitating block data: 0
Stacktrace:
	at it.a(SourceFile:76)
	at it.a(SourceFile:61)
	at iv.a(SourceFile:24)
	at zv.a(SourceFile:867)
	at iz.a(SourceFile:635)
	at zv.d(SourceFile:859)
	at amn.k(SourceFile:55)
	at amn.a(SourceFile:35)

-- Block being ticked --
Details:
	Block type: ID #13 (tile.gravel // amk)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (-274,48,288), Chunk: (at 14,3,0 in -18,18; contains blocks -288,0,288 to -273,255,303), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Stacktrace:
	at iz.a(SourceFile:430)
	at iz.b(SourceFile:142)

-- Affected level --
Details:
	Level name: New World
	All players: 1 total; [jc['TheServerGod'/50287, l='New World', x=-284,12, y=110,84, z=219,39]]
	Chunk stats: ServerChunkCache: 595 Drop: 0
	Level seed: 2032185271279910891
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (-252,64,212), Chunk: (at 4,4,4 in -16,13; contains blocks -256,0,208 to -241,255,223), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 310 game time, 310 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 38204 (now: false), thunder time: 148116 (now: false)
	Level game mode: Game mode: creative (ID 1). 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: 1.5
	Operating System: Mac OS X (x86_64) version 10.8.2
	Java Version: 1.6.0_41, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 263104256 bytes (250 MB) / 614678528 bytes (586 MB) up to 4286251008 bytes (4087 MB)
	JVM Flags: 3 total; -Xbootclasspath/a:/System/Library/PrivateFrameworks/JavaApplicationLauncher.framework/Resources/LauncherSupport.jar -Xms512M -Xmx4096M
	AABB Pool Size: 4832 (270592 bytes; 0 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: 1047 (58632 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [jc['TheServerGod'/50287, l='New World', x=-284,12, y=110,84, z=219,39]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.