Hopper: java.lang.ArrayIndexOutOfBoundsException: -1

java.lang.ArrayIndexOutOfBoundsException: -1
	at aeh.a(SourceFile:167)
	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)

---- Minecraft Crash Report ----
// Daisy, daisy...

Time: 20/09/13 14:57
Description: Getting biome

java.lang.ArrayIndexOutOfBoundsException: -1
	at aeh.a(SourceFile:167)
	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 aeh.a(SourceFile:167)
	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['Sparkgirl64'/198, l='MpServer', x=8.50, y=66.33, 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: (120,64,252), Chunk: (at 8,4,12 in 7,15; contains blocks 112,0,240 to 127,255,255), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 139758 game time, 163105 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['Sparkgirl64'/198, l='MpServer', x=8.50, y=66.33, 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, sharing), Oracle Corporation
	Memory: 122930368 bytes (117 MB) / 217796608 bytes (207 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 10057 (563192 bytes; 0 MB) allocated, 10057 (563192 bytes; 0 MB) used
	IntCache: cache: 5, tcache: 77, allocated: 12, tallocated: 94
	Launched Version: 13w38b
	LWJGL: 2.9.0
	OpenGL: AMD Radeon HD 7310 Graphics GL version 4.2.11764 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: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 68 (3808 bytes; 0 MB) allocated, 68 (3808 bytes; 0 MB) used