Hopper: java.lang.ArrayIndexOutOfBoundsException: -7

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-146773/

Crash:

java.lang.ArrayIndexOutOfBoundsException: -7
	at b.a(SourceFile:248)
	at b.a(SourceFile:235)
	at add.h(SourceFile:1260)
	at km.h(SourceFile:364)

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

---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 9/13/13 5:46 PM
Description: Exception ticking world entities

java.lang.ArrayIndexOutOfBoundsException: -7
	at b.a(SourceFile:248)
	at b.a(SourceFile:235)
	at add.h(SourceFile:1260)
	at km.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.u(SourceFile:465)
	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 b.a(SourceFile:248)
	at b.a(SourceFile:235)
	at add.h(SourceFile:1260)
	at km.h(SourceFile:364)

-- Affected level --
Details:
	Level name: Pixel art
	All players: 0 total; []
	Chunk stats: ServerChunkCache: 949 Drop: 0
	Level seed: 119958
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 2;7,2x3,2;1;village
	Level spawn location: World: (473,4,-273), Chunk: (at 9,0,15 in 29,-18; contains blocks 464,0,-288 to 479,255,-273), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 91685 game time, 91685 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 73428 (now: false), thunder time: 46929 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.u(SourceFile:465)
	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: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_09, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 151355376 bytes (144 MB) / 954466304 bytes (910 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 72 (4032 bytes; 0 MB) allocated, 72 (4032 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 22 (1232 bytes; 0 MB) allocated, 22 (1232 bytes; 0 MB) used
	Player Count: 0 / 8; []
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.touched.

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-146773/10585417/