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-703796/

Crash:

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

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

---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 11/26/13 2:40 PM
Description: Invalid Biome id

java.lang.NullPointerException: Invalid Biome id
	at agr.a(SourceFile:82)
	at agp.<init>(SourceFile:26)
	at ago.a(SourceFile:52)
	at ago.b(SourceFile:61)
	at agr.a(SourceFile:61)
	at aon.a(SourceFile:933)
	at afr.a(SourceFile:116)
	at afr.a(SourceFile:1047)
	at bmi.j(SourceFile:1343)
	at bmi.a(SourceFile:928)
	at bmi.b(SourceFile:814)
	at azh.ag(SourceFile:768)
	at azh.e(SourceFile:692)
	at net.minecraft.client.main.Main.main(SourceFile:151)


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

-- Head --
Stacktrace:
	at agr.a(SourceFile:82)

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

-- 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 afr.a(SourceFile:116)
	at afr.a(SourceFile:1047)
	at bmi.j(SourceFile:1343)
	at bmi.a(SourceFile:928)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bkb['ryan7971'/326, 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: (205,90,514), Chunk: (at 13,5,2 in 12,32; contains blocks 192,0,512 to 207,255,527), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
	Level time: 0 game time, 0 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; [bkb['ryan7971'/326, 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 bjw.a(SourceFile:284)
	at azh.b(SourceFile:1933)
	at azh.e(SourceFile:701)
	at net.minecraft.client.main.Main.main(SourceFile:151)

-- System Details --
Details:
	Minecraft Version: 13w48b
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 137949248 bytes (131 MB) / 239411200 bytes (228 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 4627 (259112 bytes; 0 MB) allocated, 4627 (259112 bytes; 0 MB) used
	IntCache: cache: 4, tcache: 86, allocated: 8, tallocated: 30
	Launched Version: 13w48b
	LWJGL: 2.9.1
	OpenGL: ATI Mobility Radeon HD 4200 GL version 2.1.8787, ATI Technologies Inc.
	GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because ARB_framebuffer_object is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

	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: 20 (1120 bytes; 0 MB) allocated, 20 (1120 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-703796/32476527/