Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-196486/

Crash:

java.lang.NullPointerException
	at aeh.a(SourceFile:82)

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

---- Minecraft Crash Report ----
// Ouch. That hurt :(

Time: 20.09.13 16:01
Description: Invalid Biome id

java.lang.NullPointerException
	at aeh.a(SourceFile:82)
	at aef.<init>(SourceFile:26)
	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:809)
	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:82)

-- DownfallBlock --
Details:
	downfalls[] size: 256
	x: 0
	z: 0
	w: 16
	h: 16
Stacktrace:
	at aeh.a(SourceFile:82)
	at aef.<init>(SourceFile:26)
	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['CraftingBox98'/69, 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: (-184,64,144), Chunk: (at 8,4,0 in -12,9; contains blocks -192,0,144 to -177,255,159), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 5137821 game time, 717525 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['CraftingBox98'/69, 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 XP (x86) version 5.1
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 132681984 bytes (126 MB) / 235532288 bytes (224 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: 104, allocated: 4, tallocated: 22
	Launched Version: 13w38b
	LWJGL: 2.9.0
	OpenGL: GeForce 7600 GS/PCIe/SSE2/3DNOW! GL version 2.1.2, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [Sphax PureBDcraft  64x MC16.zip]
	Current Language: Deutsch (Deutschland)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 13 (728 bytes; 0 MB) allocated, 13 (728 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-196486/12593227/