Hopper: java.lang.NullPointerException asm.q(SourceFile:131)

java.lang.NullPointerException
	at asm.q(SourceFile:131)
	at asm.a(SourceFile:168)
	at bja.a(SourceFile:111)
	at bfa.a(SourceFile:16)
	at bfo.a(SourceFile:6913)
	at bgt.a(SourceFile:284)
	at bgt.b(SourceFile:333)
	at awv.a(SourceFile:332)
	at awv.a(SourceFile:109)
	at axm.a(SourceFile:31)
	at axj.a(SourceFile:529)

---- Minecraft Crash Report ----
// This is a token for 1 free hug. Redeem at your nearest Mojangsta: [~~HUG~~]

Time: 02/08/13 12:03
Description: Rendering screen

java.lang.NullPointerException
	at asm.q(SourceFile:131)
	at asm.a(SourceFile:168)
	at bja.a(SourceFile:111)
	at bfa.a(SourceFile:16)
	at bfo.a(SourceFile:6913)
	at bgt.a(SourceFile:284)
	at bgt.b(SourceFile:333)
	at awv.a(SourceFile:332)
	at awv.a(SourceFile:109)
	at axm.a(SourceFile:31)
	at axj.a(SourceFile:529)
	at bfb.b(SourceFile:718)
	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 asm.q(SourceFile:131)
	at asm.a(SourceFile:168)
	at bja.a(SourceFile:111)
	at bfa.a(SourceFile:16)
	at bfo.a(SourceFile:6913)
	at bgt.a(SourceFile:284)
	at bgt.b(SourceFile:333)
	at awv.a(SourceFile:332)
	at awv.a(SourceFile:109)
	at axm.a(SourceFile:31)
	at axj.a(SourceFile:529)

-- Screen render details --
Details:
	Screen name: axj
	Mouse location: Scaled: (210, 62). Absolute: (630, 652)
	Screen size: Scaled: (534, 280). Absolute: (1600, 838). Scale factor of 3

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdf['Korialastraz'/332228, l='MpServer', x=410,71, y=5,62, z=-374,07]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (411,4,-382), Chunk: (at 11,0,2 in 25,-24; contains blocks 400,0,-384 to 415,255,-369), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 499 game time, 499 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['Korialastraz'/332228, l='MpServer', x=410,71, y=5,62, z=-374,07]]
	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:628)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.2
	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: 9904848 bytes (9 MB) / 518979584 bytes (494 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 77024 (4313344 bytes; 4 MB) allocated, 47 (2632 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 1, tallocated: 71
	Launched Version: 1.6.2
	LWJGL: 2.9.0
	OpenGL: GeForce 310M/PCI/SSE2 GL version 3.1 NVIDIA 189.11, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Current Language: Français (CA)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 244 (13664 bytes; 0 MB) allocated, 76 (4256 bytes; 0 MB) used