Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at zf.d(SourceFile:104)
	at bjq.a(SourceFile:148)
	at bjq.a(SourceFile:29)
	at bjg.b(SourceFile:35)
	at bjq.a(SourceFile:45)
	at bjq.a(SourceFile:29)

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 12/09/13 17:27
Description: Rendering entity in world

java.lang.NullPointerException
	at zf.d(SourceFile:104)
	at bjq.a(SourceFile:148)
	at bjq.a(SourceFile:29)
	at bjg.b(SourceFile:35)
	at bjq.a(SourceFile:45)
	at bjq.a(SourceFile:29)
	at bjf.a(SourceFile:206)
	at bjf.a(SourceFile:186)
	at bie.a(SourceFile:327)
	at bhx.a(SourceFile:848)
	at bhx.b(SourceFile:695)
	at awl.V(SourceFile:717)
	at awl.e(SourceFile:646)
	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 zf.d(SourceFile:104)
	at bjq.a(SourceFile:148)
	at bjq.a(SourceFile:29)
	at bjg.b(SourceFile:35)
	at bjq.a(SourceFile:45)
	at bjq.a(SourceFile:29)

-- Entity being rendered --
Details:
	Entity Type: Item (tr)
	Entity ID: 537785
	Entity Name: ~~ERROR~~ NullPointerException: null
	Entity's Exact location: -421,50, 58,00, 376,50
	Entity's Block location: World: (-422,58,376), Chunk: (at 10,3,8 in -27,23; contains blocks -432,0,368 to -417,255,383), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Entity's Momentum: -0,22, 0,16, 0,05

-- Renderer details --
Details:
	Assigned renderer: bjq@4256b1ad
	Location: -11,81,0,38,1,59 - World: (-12,0,1), Chunk: (at 4,0,1 in -1,0; contains blocks -16,0,0 to -1,255,15), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Rotation: 20.873735
	Delta: 0.20333624
Stacktrace:
	at bjf.a(SourceFile:206)
	at bjf.a(SourceFile:186)
	at bie.a(SourceFile:327)
	at bhx.a(SourceFile:848)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfw['Serchugar'/8, l='MpServer', x=-409,85, y=57,62, z=374,92]]
	Chunk stats: MultiplayerChunkCache: 316, 316
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-419,4,377), Chunk: (at 13,0,9 in -27,23; contains blocks -432,0,368 to -417,255,383), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 111249 game time, 10758 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: ~~ERROR~~ NullPointerException: null
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bfr.a(SourceFile:285)
	at awl.b(SourceFile:1821)
	at awl.e(SourceFile:655)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w37a
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 64773336 bytes (61 MB) / 258539520 bytes (246 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 333 (18648 bytes; 0 MB) allocated, 188 (10528 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w37a
	LWJGL: 2.9.0
	OpenGL: GeForce G210/PCIe/SSE2 GL version 3.3.0, NVIDIA Corporation
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: Español (España)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 78 (4368 bytes; 0 MB) allocated, 43 (2408 bytes; 0 MB) used