Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-83391/

Crash:

java.lang.NullPointerException
	at adw.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: 6/09/13 15:16
Description: Invalid Biome id

java.lang.NullPointerException
	at adw.a(SourceFile:82)
	at adu.<init>(SourceFile:26)
	at adt.a(SourceFile:52)
	at adt.b(SourceFile:61)
	at adw.a(SourceFile:61)
	at aez.a(SourceFile:926)
	at act.a(SourceFile:101)
	at act.a(SourceFile:1046)
	at bho.i(SourceFile:1191)
	at bho.a(SourceFile:787)
	at bho.b(SourceFile:695)
	at awb.V(SourceFile:713)
	at awb.e(SourceFile:642)
	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 adw.a(SourceFile:82)

-- DownfallBlock --
Details:
	downfalls[] size: 256
	x: 0
	z: 0
	w: 16
	h: 16
Stacktrace:
	at adw.a(SourceFile:82)
	at adu.<init>(SourceFile:26)
	at adt.a(SourceFile:52)
	at adt.b(SourceFile:61)
	at adw.a(SourceFile:61)
	at aez.a(SourceFile:926)

-- 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 act.a(SourceFile:101)
	at act.a(SourceFile:1046)
	at bho.i(SourceFile:1191)
	at bho.a(SourceFile:787)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfn['Adolfoelcapo'/254009, l='MpServer', x=8,50, y=66,62, z=8,50]]
	Chunk stats: MultiplayerChunkCache: 0, 0
	Level seed: 0
	Level generator: ID 03 - amplified, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (256,64,72), Chunk: (at 0,4,8 in 16,4; contains blocks 256,0,64 to 271,255,79), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 1489 game time, 1489 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; [bfn['Adolfoelcapo'/254009, 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 bfi.a(SourceFile:285)
	at awb.b(SourceFile:1813)
	at awb.e(SourceFile:651)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w36b
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_09, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 413041528 bytes (393 MB) / 776077312 bytes (740 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 19252 (1078112 bytes; 1 MB) allocated, 10819 (605864 bytes; 0 MB) used
	IntCache: cache: 8, tcache: 85, allocated: 4, tallocated: 28
	Launched Version: 13w36b
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics GL version 2.1.0 - Build 8.15.10.2202, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (UK)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 12 (672 bytes; 0 MB) allocated, 12 (672 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-83391/8322912/