Hopper: java.lang.NullPointerException: Invalid Biome id

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-312450/

Crash:

java.lang.NullPointerException: Invalid Biome id
	at agf.a(SourceFile:82)

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

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3

Time: 11/10/13 13:11
Description: Invalid Biome id

java.lang.NullPointerException: Invalid Biome id
	at agf.a(SourceFile:82)
	at agd.<init>(SourceFile:26)
	at agc.a(SourceFile:52)
	at agc.b(SourceFile:61)
	at agf.a(SourceFile:61)
	at anv.a(SourceFile:933)
	at afe.a(SourceFile:115)
	at afe.a(SourceFile:1046)
	at bkr.i(SourceFile:1330)
	at bkr.a(SourceFile:919)
	at bkr.b(SourceFile:814)
	at ayp.ab(SourceFile:783)
	at ayp.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 agf.a(SourceFile:82)

-- DownfallBlock --
Details:
	biome id: 0
	downfalls[] size: 256
	x: 0
	z: 0
	w: 16
	h: 16
Stacktrace:
	at agf.a(SourceFile:82)
	at agd.<init>(SourceFile:26)
	at agc.a(SourceFile:52)
	at agc.b(SourceFile:61)
	at agf.a(SourceFile:61)
	at anv.a(SourceFile:933)

-- Coordinates of biome request --
Details:
	Location: World: (670,0,512), Chunk: (at 14,0,0 in 41,32; contains blocks 656,0,512 to 671,255,527), Region: (1,1; contains chunks 32,32 to 63,63, blocks 512,0,512 to 1023,255,1023)
Stacktrace:
	at afe.a(SourceFile:115)
	at afe.a(SourceFile:1046)
	at bkr.i(SourceFile:1330)
	at bkr.a(SourceFile:919)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bil['abf_craft'/108527, l='MpServer', x=670,50, y=73,72, z=512,50]]
	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: (248,64,236), Chunk: (at 8,4,12 in 15,14; contains blocks 240,0,224 to 255,255,239), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 9578628 game time, 36442 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; [bil['abf_craft'/108527, l='MpServer', x=670,50, y=73,72, z=512,50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at big.a(SourceFile:302)
	at ayp.b(SourceFile:1935)
	at ayp.e(SourceFile:715)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w41b
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_17, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 256967504 bytes (245 MB) / 656080896 bytes (625 MB) up to 2863333376 bytes (2730 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G
	AABB Pool Size: 1942 (108752 bytes; 0 MB) allocated, 1942 (108752 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 18, allocated: 12, tallocated: 94
	Launched Version: 13w41b
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics 3000 GL version 3.1.0 - Build 9.17.10.2932, Intel
	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: 16 (896 bytes; 0 MB) allocated, 16 (896 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-312450/16841066/