Hopper: java.lang.NullPointerException (SourceFile:509)

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-66/

Crash:

java.lang.NullPointerException
	at bfg.a(SourceFile:509)
	at bfg.b(SourceFile:467)
	at bfb.b(SourceFile:474)
	at bfb.a(SourceFile:930)

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

---- Minecraft Crash Report ----
// I let you down. Sorry :(

Time: 02/08/13 13:43
Description: Unexpected error

java.lang.NullPointerException
	at bfg.a(SourceFile:509)
	at bfg.b(SourceFile:467)
	at bfb.b(SourceFile:474)
	at bfb.a(SourceFile:930)
	at bfb.b(SourceFile:693)
	at ats.S(SourceFile:686)
	at ats.d(SourceFile:619)
	at net.minecraft.client.main.Main.main(SourceFile:101)


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

-- Head --
Stacktrace:
	at bfg.a(SourceFile:509)
	at bfg.b(SourceFile:467)
	at bfb.b(SourceFile:474)
	at bfb.a(SourceFile:930)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdf['Bearscombe'/229827, l='MpServer', x=1000.07, y=0.50, z=1003.49]]
	Chunk stats: MultiplayerChunkCache: 170
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-43,4,-705), Chunk: (at 5,0,15 in -3,-45; contains blocks -48,0,-720 to -33,255,-705), Region: (-1,-2; contains chunks -32,-64 to -1,-33, blocks -512,0,-1024 to -1,255,-513)
	Level time: 135454 game time, 10531 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; [bdf['Bearscombe'/229827, l='MpServer', x=1000.07, y=0.50, z=1003.49]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bda.a(SourceFile:284)
	at ats.b(SourceFile:1761)
	at ats.d(SourceFile:633)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	Operating System: Windows Vista (x86) version 6.0
	Java Version: 1.7.0_05, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 145087504 bytes (138 MB) / 444764160 bytes (424 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 18931 (1060136 bytes; 1 MB) allocated, 110 (6160 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Launched Version: 1.6.2
	LWJGL: 2.9.0
	OpenGL: Intel Bear Lake B GL version 1.4.0 - Build 7.14.10.1437, Intel
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Current Language: English (UK)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 154 (8624 bytes; 0 MB) allocated, 154 (8624 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-66/21825/