Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at aey.a(SourceFile:927)
	at act.a(SourceFile:100)
	at act.a(SourceFile:1032)
	at bhh.i(SourceFile:1191)
	at bhh.a(SourceFile:787)

---- Minecraft Crash Report ----
// Oh - I know what I did wrong!

Time: 9/5/13 7:08 PM
Description: Unexpected error

java.lang.NullPointerException
	at aey.a(SourceFile:927)
	at act.a(SourceFile:100)
	at act.a(SourceFile:1032)
	at bhh.i(SourceFile:1191)
	at bhh.a(SourceFile:787)
	at bhh.b(SourceFile:695)
	at avx.V(SourceFile:713)
	at avx.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 aey.a(SourceFile:927)
	at act.a(SourceFile:100)
	at act.a(SourceFile:1032)
	at bhh.i(SourceFile:1191)
	at bhh.a(SourceFile:787)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfg['giddiensshane'/92, 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: (133,64,-643), Chunk: (at 5,4,13 in 8,-41; contains blocks 128,0,-656 to 143,255,-641), Region: (0,-2; contains chunks 0,-64 to 31,-33, blocks 0,0,-1024 to 511,255,-513)
	Level time: 16009 game time, 16009 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; [bfg['giddiensshane'/92, 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 bfb.a(SourceFile:285)
	at avx.b(SourceFile:1813)
	at avx.e(SourceFile:656)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w36a
	Operating System: Windows Vista (x86) version 6.0
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 98611576 bytes (94 MB) / 171675648 bytes (163 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 1299 (72744 bytes; 0 MB) allocated, 1299 (72744 bytes; 0 MB) used
	Suspicious classes: [com.ibm.icu.text.ArabicShapingException], [gnu.trove.TIntCollection], [gnu.trove.impl.HashFunctions, PrimeFinder], [gnu.trove.impl.hash.THash, TPrimitiveHash, TIntIntHash], [gnu.trove.iterator.TIterator, TAdvancingIterator, TIntIntIterator], [gnu.trove.map.TIntIntMap], [gnu.trove.map.hash.TIntIntHashMap], [gnu.trove.procedure.TIntIntProcedure], [gnu.trove.set.TIntSet]
	IntCache: cache: 0, tcache: 48, allocated: 13, tallocated: 95
	Launched Version: 13w36a
	LWJGL: 2.9.0
	OpenGL: GeForce GT 610/PCIe/SSE2 GL version 4.3.0, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 13 (728 bytes; 0 MB) allocated, 13 (728 bytes; 0 MB) used