Hopper: java.lang.ArrayIndexOutOfBoundsException: 6

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-145600/

Crash:

java.lang.ArrayIndexOutOfBoundsException: 6
	at avm.a(SourceFile:205)
	at km.a(SourceFile:713)
	at km.aa(SourceFile:702)
	at km.b(SourceFile:149)

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

---- Minecraft Crash Report ----
// Why did you do that?

Time: 9/14/13 3:11 PM
Description: Exception ticking world

java.lang.ArrayIndexOutOfBoundsException: 6
	at avm.a(SourceFile:205)
	at km.a(SourceFile:713)
	at km.aa(SourceFile:702)
	at km.b(SourceFile:149)
	at net.minecraft.server.MinecraftServer.u(SourceFile:457)
	at net.minecraft.server.MinecraftServer.t(SourceFile:400)
	at bnz.t(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:334)
	at jb.run(SourceFile:577)


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

-- Head --
Stacktrace:
	at avm.a(SourceFile:205)
	at km.a(SourceFile:713)
	at km.aa(SourceFile:702)
	at km.b(SourceFile:149)

-- Affected level --
Details:
	Level name: 1.7 stuff
	All players: 1 total; [kp['Vanhoosen'/2469, l='1.7 stuff', x=-80.22, y=56.00, z=2270.01]]
	Chunk stats: ServerChunkCache: 496 Drop: 0
	Level seed: 7835297342518269658
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options: 2;7,3x1,52x24;2;
	Level spawn location: World: (-60,4,2283), Chunk: (at 4,0,11 in -4,142; contains blocks -64,0,2272 to -49,255,2287), Region: (-1,4; contains chunks -32,128 to -1,159, blocks -512,0,2048 to -1,255,2559)
	Level time: 189697 game time, 3191 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 77365 (now: false), thunder time: 38312 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.u(SourceFile:457)
	at net.minecraft.server.MinecraftServer.t(SourceFile:400)
	at bnz.t(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:334)
	at jb.run(SourceFile:577)

-- System Details --
Details:
	Minecraft Version: 13w37b
	Operating System: Mac OS X (x86_64) version 10.6.8
	Java Version: 1.6.0_43, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 115149232 bytes (109 MB) / 320892928 bytes (306 MB) up to 1069416448 bytes (1019 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 90 (5040 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 4 (224 bytes; 0 MB) allocated, 0 (0 bytes; 0 MB) used
	Player Count: 1 / 8; [kp['Vanhoosen'/2469, l='1.7 stuff', x=-80.22, y=56.00, z=2270.01]]
	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-145600/11069622/