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-963458/

Crash:

java.lang.NullPointerException: Invalid Biome id
	at ahu.a(SourceFile:84)

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: 17:52 09/01/14
Description: Invalid Biome id

java.lang.NullPointerException: Invalid Biome id
	at ahu.a(SourceFile:84)
	at ahs.<init>(SourceFile:27)
	at ahr.a(SourceFile:53)
	at ahr.d(SourceFile:88)
	at ahu.a(SourceFile:165)
	at ahu.b(SourceFile:155)
	at are.d(SourceFile:195)
	at na.c(SourceFile:86)
	at na.d(SourceFile:116)
	at agv.b(SourceFile:275)
	at nb.h(SourceFile:265)
	at nb.c(SourceFile:164)
	at net.minecraft.server.MinecraftServer.u(SourceFile:520)
	at net.minecraft.server.MinecraftServer.t(SourceFile:462)
	at bvc.t(SourceFile:123)
	at net.minecraft.server.MinecraftServer.run(SourceFile:380)
	at lr.run(SourceFile:648)


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

-- Head --
Stacktrace:
	at ahu.a(SourceFile:84)

-- DownfallBlock --
Details:
	biome id: 13
	downfalls[] size: 256
	x: -416
	z: 272
	w: 16
	h: 16
Stacktrace:
	at ahu.a(SourceFile:84)
	at ahs.<init>(SourceFile:27)
	at ahr.a(SourceFile:53)
	at ahr.d(SourceFile:88)
	at ahu.a(SourceFile:165)
	at ahu.b(SourceFile:155)
	at are.d(SourceFile:195)

-- Chunk to be generated --
Details:
	Location: -26,17
	Position hash: 77309411302
	Generator: RandomLevelSource
Stacktrace:
	at na.c(SourceFile:86)
	at na.d(SourceFile:116)
	at agv.b(SourceFile:275)
	at nb.h(SourceFile:265)
	at nb.c(SourceFile:164)

-- Affected level --
Details:
	Level name: New World
	All players: 1 total; [ne['Track140'/237, l='New World', x=-144.03, y=70.51, z=244.30]]
	Chunk stats: ServerChunkCache: 1197 Drop: 0
	Level seed: -6861166206557655364
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: -124.00,64.00,256.00 - World: (-124,64,256), Chunk: (at 4,4,0 in -8,16; contains blocks -128,0,256 to -113,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 321 game time, 321 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 155864 (now: false), thunder time: 76716 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.u(SourceFile:520)
	at net.minecraft.server.MinecraftServer.t(SourceFile:462)
	at bvc.t(SourceFile:123)
	at net.minecraft.server.MinecraftServer.run(SourceFile:380)
	at lr.run(SourceFile:648)

-- System Details --
Details:
	Minecraft Version: 14w02b
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 825116496 bytes (786 MB) / 1211629568 bytes (1155 MB) up to 2863661056 bytes (2731 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx3G
	IntCache: cache: 1, tcache: 21, allocated: 13, tallocated: 95
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [ne['Track140'/237, l='New World', x=-144.03, y=70.51, z=244.30]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-963458/47046445/