Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at zg.d(SourceFile:104)
	at bjt.a(SourceFile:148)
	at bjt.a(SourceFile:29)
	at bjj.b(SourceFile:35)
	at bjt.a(SourceFile:45)
	at bjt.a(SourceFile:29)

---- Minecraft Crash Report ----
// Don't do that.

Time: 13/09/13 14:17
Description: Rendering entity in world

java.lang.NullPointerException
	at zg.d(SourceFile:104)
	at bjt.a(SourceFile:148)
	at bjt.a(SourceFile:29)
	at bjj.b(SourceFile:35)
	at bjt.a(SourceFile:45)
	at bjt.a(SourceFile:29)
	at bji.a(SourceFile:206)
	at bji.a(SourceFile:186)
	at bih.a(SourceFile:327)
	at bia.a(SourceFile:848)
	at bia.b(SourceFile:695)
	at awo.V(SourceFile:717)
	at awo.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 zg.d(SourceFile:104)
	at bjt.a(SourceFile:148)
	at bjt.a(SourceFile:29)
	at bjj.b(SourceFile:35)
	at bjt.a(SourceFile:45)
	at bjt.a(SourceFile:29)

-- Entity being rendered --
Details:
	Entity Type: Item (ts)
	Entity ID: 8950
	Entity Name: ~~ERROR~~ NullPointerException: null
	Entity's Exact location: 234.47, 69.34, 257.53
	Entity's Block location: World: (234,69,257), Chunk: (at 10,4,1 in 14,16; contains blocks 224,0,256 to 239,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Entity's Momentum: -0.02, 0.20, 0.05

-- Renderer details --
Details:
	Assigned renderer: bjt@6272f16
	Location: -0.84,-1.28,-1.19 - World: (-1,-2,-2), Chunk: (at 15,-1,14 in -1,-1; contains blocks -16,0,-16 to -1,255,-1), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Rotation: 104.24221
	Delta: 0.40729558
Stacktrace:
	at bji.a(SourceFile:206)
	at bji.a(SourceFile:186)
	at bih.a(SourceFile:327)
	at bia.a(SourceFile:848)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bfz['xPaw'/719, l='MpServer', x=235.31, y=70.62, z=258.73]]
	Chunk stats: MultiplayerChunkCache: 225, 225
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (224,64,256), Chunk: (at 0,4,0 in 14,16; contains blocks 224,0,256 to 239,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 1544 game time, 1544 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 bfu.a(SourceFile:285)
	at awo.b(SourceFile:1821)
	at awo.e(SourceFile:655)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 13w37b
	Operating System: Windows 8 (amd64) version 6.2
	Java Version: 1.7.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 297849984 bytes (284 MB) / 626393088 bytes (597 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms512M -Xmx1024M
	AABB Pool Size: 1826 (102256 bytes; 0 MB) allocated, 1826 (102256 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 13w37b
	LWJGL: 2.9.0
	OpenGL: GeForce GT 220/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: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 667 (37352 bytes; 0 MB) allocated, 255 (14280 bytes; 0 MB) used