Hopper: java.lang.ArrayIndexOutOfBoundsException: -7

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-315273/

Crash:

java.lang.ArrayIndexOutOfBoundsException: -7
	at b.a(SourceFile:263)
	at b.a(SourceFile:250)
	at afe.h(SourceFile:1255)
	at mc.h(SourceFile:364)

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 10/13/13 10:56 AM
Description: Exception ticking world entities

java.lang.ArrayIndexOutOfBoundsException: -7
	at b.a(SourceFile:263)
	at b.a(SourceFile:250)
	at afe.h(SourceFile:1255)
	at mc.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.u(SourceFile:511)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at brh.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at kt.run(SourceFile:617)


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

-- Head --
Stacktrace:
	at b.a(SourceFile:263)
	at b.a(SourceFile:250)
	at afe.h(SourceFile:1255)
	at mc.h(SourceFile:364)

-- Affected level --
Details:
	Level name: Nuke
	All players: 1 total; [mf['donkzwonkz'/0, l='Nuke', x=-249.47, y=74.09, z=700.07]]
	Chunk stats: ServerChunkCache: 17503 Drop: 0
	Level seed: -5421996657818327185
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options: 2;7,3x1,52x24;2;
	Level spawn location: World: (-434,4,615), Chunk: (at 14,0,7 in -28,38; contains blocks -448,0,608 to -433,255,623), Region: (-1,1; contains chunks -32,32 to -1,63, blocks -512,0,512 to -1,255,1023)
	Level time: 8616 game time, 8616 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 55545 (now: false), thunder time: 50146 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.u(SourceFile:511)
	at net.minecraft.server.MinecraftServer.t(SourceFile:441)
	at brh.t(SourceFile:117)
	at net.minecraft.server.MinecraftServer.run(SourceFile:358)
	at kt.run(SourceFile:617)

-- System Details --
Details:
	Minecraft Version: 13w41b
	Operating System: Mac OS X (x86_64) version 10.6.8
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 138328912 bytes (131 MB) / 1060372480 bytes (1011 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 15321 (857976 bytes; 0 MB) allocated, 8541 (478296 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 195178 (10929968 bytes; 10 MB) allocated, 184881 (10353336 bytes; 9 MB) used
	Player Count: 1 / 8; [mf['donkzwonkz'/0, l='Nuke', x=-249.47, y=74.09, z=700.07]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-315273/17496811/