Hopper: java.lang.ArrayIndexOutOfBoundsException: 2563

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-196455/

Crash:

java.lang.ArrayIndexOutOfBoundsException: 2563
	at ana.a(SourceFile:159)

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: 20.9.2013 16:57
Description: Comparing biomes

java.lang.ArrayIndexOutOfBoundsException: 2563
	at ana.a(SourceFile:159)
	at ane.a(SourceFile:67)
	at and.a(SourceFile:13)
	at anp.a(SourceFile:20)
	at amo.a(SourceFile:16)
	at anp.a(SourceFile:20)
	at anj.a(SourceFile:13)
	at anp.a(SourceFile:20)
	at anp.a(SourceFile:20)
	at ank.a(SourceFile:15)
	at ani.a(SourceFile:24)
	at ano.a(SourceFile:23)
	at aeh.a(SourceFile:165)
	at aef.<init>(SourceFile:27)
	at aee.a(SourceFile:52)
	at aee.b(SourceFile:61)
	at aeh.a(SourceFile:61)
	at afk.a(SourceFile:930)
	at ade.a(SourceFile:101)
	at ade.a(SourceFile:1026)
	at bii.i(SourceFile:1316)
	at bii.a(SourceFile:912)
	at bii.b(SourceFile:807)
	at awp.aa(SourceFile:754)
	at awp.e(SourceFile:677)
	at net.minecraft.client.main.Main.main(SourceFile:104)


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

-- Head --
Stacktrace:
	at ana.a(SourceFile:159)

-- Biomes being compared --
Details:
	Biome A ID: 2563
	Biome B ID: 38
	Biome A: ~~ERROR~~ ArrayIndexOutOfBoundsException: 2563
	Biome B: aer@f804ee
Stacktrace:
	at ana.a(SourceFile:159)
	at ane.a(SourceFile:67)
	at and.a(SourceFile:13)
	at anp.a(SourceFile:20)
	at amo.a(SourceFile:16)
	at anp.a(SourceFile:20)
	at anj.a(SourceFile:13)
	at anp.a(SourceFile:20)
	at anp.a(SourceFile:20)
	at ank.a(SourceFile:15)
	at ani.a(SourceFile:24)
	at ano.a(SourceFile:23)
	at aeh.a(SourceFile:165)
	at aef.<init>(SourceFile:27)
	at aee.a(SourceFile:52)
	at aee.b(SourceFile:61)
	at aeh.a(SourceFile:61)
	at afk.a(SourceFile:930)

-- Coordinates of biome request --
Details:
	Location: World: (8,0,8), Chunk: (at 8,0,8 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Stacktrace:
	at ade.a(SourceFile:101)
	at ade.a(SourceFile:1026)
	at bii.i(SourceFile:1316)
	at bii.a(SourceFile:912)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bgh['MIIKASIMONEN'/52, l='MpServer', x=8,50, y=66,62, z=8,50]]
	Chunk stats: MultiplayerChunkCache: 0, 0
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (109,64,149), Chunk: (at 13,4,5 in 6,9; contains blocks 96,0,144 to 111,255,159), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 679061 game time, 824113 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: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 1 total; [bgh['MIIKASIMONEN'/52, l='MpServer', x=8,50, y=66,62, z=8,50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bgc.a(SourceFile:297)
	at awp.b(SourceFile:1874)
	at awp.e(SourceFile:686)
	at net.minecraft.client.main.Main.main(SourceFile:104)

-- System Details --
Details:
	Minecraft Version: 13w38b
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 117854584 bytes (112 MB) / 204083200 bytes (194 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 10003 (560168 bytes; 0 MB) allocated, 10003 (560168 bytes; 0 MB) used
	IntCache: cache: 8, tcache: 85, allocated: 4, tallocated: 24
	Launched Version: 13w38b
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 7640G + 7670M Dual Graphics GL version 4.2.11774 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: suomi (FI)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 11 (616 bytes; 0 MB) allocated, 11 (616 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-196455/12592122/