Hopper: java.lang.ArrayIndexOutOfBoundsException: 8776

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-398478/

Crash:

java.lang.ArrayIndexOutOfBoundsException: 8776
	at azz.a(SourceFile:473)
	at azz.a(SourceFile:507)
	at azz.a(SourceFile:494)
	at bai.i(SourceFile:476)
	at bai.e(SourceFile:180)
	at bai.d(SourceFile:170)
	at bai.b(SourceFile:99)
	at bai.a(SourceFile:284)
	at bdg.a(SourceFile:87)
	at bbw.l(SourceFile:258)
	at bbw.k(SourceFile:217)

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

---- Minecraft Crash Report ----
// My bad.

Time: 10/18/13 7:16 PM
Description: Updating screen events

java.lang.ArrayIndexOutOfBoundsException: 8730
	at azz.a(SourceFile:473)
	at azz.a(SourceFile:507)
	at azz.a(SourceFile:494)
	at bai.i(SourceFile:476)
	at bai.e(SourceFile:180)
	at bai.d(SourceFile:170)
	at bai.b(SourceFile:99)
	at bai.a(SourceFile:284)
	at bdg.a(SourceFile:87)
	at bbw.l(SourceFile:258)
	at bbw.k(SourceFile:217)
	at ayw.o(SourceFile:1302)
	at ayw.ad(SourceFile:755)
	at ayw.e(SourceFile:706)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at azz.a(SourceFile:473)
	at azz.a(SourceFile:507)
	at azz.a(SourceFile:494)
	at bai.i(SourceFile:476)
	at bai.e(SourceFile:180)
	at bai.d(SourceFile:170)
	at bai.b(SourceFile:99)
	at bai.a(SourceFile:284)
	at bdg.a(SourceFile:87)
	at bbw.l(SourceFile:258)
	at bbw.k(SourceFile:217)

-- Affected screen --
Details:
	Screen name: bdg

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [biw['l3wibot'/0, l='MpServer', x=-988.49, y=48.62, z=-928.37]]
	Chunk stats: MultiplayerChunkCache: 240, 240
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-984,4,-929), Chunk: (at 8,0,15 in -62,-59; contains blocks -992,0,-944 to -977,255,-929), Region: (-2,-2; contains chunks -64,-64 to -33,-33, blocks -1024,0,-1024 to -513,255,-513)
	Level time: 39828 game time, 39828 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: false
	Forced entities: 1 total; [biw['l3wibot'/0, l='MpServer', x=-988.49, y=48.62, z=-928.37]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bir.a(SourceFile:284)
	at ayw.b(SourceFile:1938)
	at ayw.e(SourceFile:715)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w42b
	Operating System: Mac OS X (x86_64) version 10.8.5
	Java Version: 1.6.0_51, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 42418152 bytes (40 MB) / 139702272 bytes (133 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 1 total; -Xmx1G
	AABB Pool Size: 122 (6832 bytes; 0 MB) allocated, 2 (112 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w42b
	LWJGL: 2.9.1
	OpenGL: Intel HD Graphics 3000 OpenGL Engine GL version 2.1 INTEL-8.16.74, Intel Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (UK)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 49 (2744 bytes; 0 MB) allocated, 15 (840 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-398478/19118463/