Hopper: java.lang.ArrayIndexOutOfBoundsException: -7

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-295621/

Crash:

java.lang.ArrayIndexOutOfBoundsException: -7
	at b.a(SourceFile:330)
	at b.a(SourceFile:317)
	at abv.h(SourceFile:1237)
	at jr.h(SourceFile:364)

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

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 10/10/13 18:11
Description: Exception ticking world entities

java.lang.ArrayIndexOutOfBoundsException: -7
	at b.a(SourceFile:330)
	at b.a(SourceFile:317)
	at abv.h(SourceFile:1237)
	at jr.h(SourceFile:364)
	at net.minecraft.server.MinecraftServer.t(SourceFile:470)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at bkw.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)


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

-- Head --
Stacktrace:
	at b.a(SourceFile:330)
	at b.a(SourceFile:317)
	at abv.h(SourceFile:1237)
	at jr.h(SourceFile:364)

-- Affected level --
Details:
	Level name: Hard aventure
	All players: 1 total; [ju['themagma44'/1131237, l='Hard aventure', x=-471,02, y=62,13, z=1119,05]]
	Chunk stats: ServerChunkCache: 1195 Drop: 0
	Level seed: -207002119
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (160,64,252), Chunk: (at 0,4,12 in 10,15; contains blocks 160,0,240 to 175,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 315372 game time, 38571 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 132924 (now: false), thunder time: 67642 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.t(SourceFile:470)
	at net.minecraft.server.MinecraftServer.s(SourceFile:405)
	at bkw.s(SourceFile:124)
	at net.minecraft.server.MinecraftServer.run(SourceFile:339)
	at hh.run(SourceFile:582)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_40, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 1657552 bytes (1 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 6231 (348936 bytes; 0 MB) allocated, 3647 (204232 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: 1931 (108136 bytes; 0 MB) allocated, 1259 (70504 bytes; 0 MB) used
	Player Count: 1 / 8; [ju['themagma44'/1131237, l='Hard aventure', x=-471,02, y=62,13, z=1119,05]]
	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-295621/16555676/