Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at bjt.a(SourceFile:44)
	at bjt.a(SourceFile:16)

---- Minecraft Crash Report ----
// Oops.

Time: 9/20/13 9:04 AM
Description: Rendering entity in world

java.lang.NullPointerException
	at bjt.a(SourceFile:44)
	at bjt.a(SourceFile:16)
	at bjq.a(SourceFile:215)
	at bjq.a(SourceFile:196)
	at bmt.a(SourceFile:30)
	at bmt.a(SourceFile:15)
	at bmt.a(SourceFile:10)
	at bmy.a(SourceFile:100)
	at bmy.a(SourceFile:92)
	at bip.a(SourceFile:354)
	at bii.a(SourceFile:974)
	at bii.b(SourceFile:809)
	at awp.aa(SourceFile:754)
	at awp.e(SourceFile:677)
	at net.minecraft.client.main.Main.main(SourceFile:104)


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

-- Head --
Stacktrace:
	at bjt.a(SourceFile:44)
	at bjt.a(SourceFile:16)

-- Entity being rendered --
Details:
	Entity Type: FallingSand (ts)
	Entity ID: 4673
	Entity Name: Falling Block
	Entity's Exact location: -18.24, -7.87, -61.41
	Entity's Block location: World: (-19,-8,-62), Chunk: (at 13,-1,2 in -2,-4; contains blocks -32,0,-64 to -17,255,-49), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Entity's Momentum: 0.00, 0.00, 0.00
	Immitating block ID: -1
	Immitating block data: 0

-- Renderer details --
Details:
	Assigned renderer: bjt@6f253de9
	Location: 0.00,0.00,0.00 - World: (0,0,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Rotation: 0.0
	Delta: 0.0066063404
Stacktrace:
	at bjq.a(SourceFile:215)
	at bjq.a(SourceFile:196)
	at bmt.a(SourceFile:30)
	at bmt.a(SourceFile:15)
	at bmt.a(SourceFile:10)

-- Tile Entity Details --
Details:
	Name: MobSpawner // avd
	Block type: ID #52 (tile.mobSpawner // asa)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (-2179,43,909), Chunk: (at 13,2,13 in -137,56; contains blocks -2192,0,896 to -2177,255,911), Region: (-5,1; contains chunks -160,32 to -129,63, blocks -2560,0,512 to -2049,255,1023)
	Actual block type: ID #52 (tile.mobSpawner // asa)
	Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
	at bmy.a(SourceFile:100)
	at bmy.a(SourceFile:92)
	at bip.a(SourceFile:354)
	at bii.a(SourceFile:974)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bgh['danielgane'/14, l='MpServer', x=-2160.78, y=50.79, z=970.14]]
	Chunk stats: MultiplayerChunkCache: 315, 315
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (-2134,77,522), Chunk: (at 10,4,10 in -134,32; contains blocks -2144,0,512 to -2129,255,527), Region: (-5,1; contains chunks -160,32 to -129,63, blocks -2560,0,512 to -2049,255,1023)
	Level time: 17602918 game time, 17617 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: adventure (ID 2). Hardcore: false. Cheats: false
	Forced entities: 41 total; [pk['Painting'/12, l='MpServer', x=-2168.94, y=49.50, z=907.50], pk['Painting'/11, l='MpServer', x=-2168.94, y=49.50, z=907.50], ua['entity.MinecartSpawner.name'/2, l='MpServer', x=-2171.50, y=19.59, z=927.09], ua['entity.MinecartSpawner.name'/3, l='MpServer', x=-2169.50, y=19.56, z=927.06], ua['entity.MinecartSpawner.name'/4, l='MpServer', x=-2170.50, y=20.34, z=927.84], pk['Painting'/5, l='MpServer', x=-2169.00, y=49.50, z=916.94], pk['Painting'/6, l='MpServer', x=-2161.06, y=49.50, z=921.00], pk['Painting'/7, l='MpServer', x=-2169.00, y=49.50, z=916.94], vc['§aVeseng'/8, l='MpServer', x=-2170.44, y=48.00, z=920.50], pk['Painting'/9, l='MpServer', x=-2178.50, y=49.50, z=917.06], vc['Villager'/10, l='MpServer', x=-2174.91, y=39.00, z=910.66], pk['Painting'/11, l='MpServer', x=-2168.94, y=49.50, z=907.50], pk['Painting'/12, l='MpServer', x=-2168.94, y=49.50, z=907.50], pk['Painting'/38, l='MpServer', x=-2178.50, y=49.50, z=897.94], pk['Painting'/35, l='MpServer', x=-2188.06, y=49.50, z=907.50], pk['Painting'/13, l='MpServer', x=-2184.06, y=47.50, z=928.50], pk['Painting'/37, l='MpServer', x=-2178.50, y=49.50, z=897.94], pk['Painting'/36, l='MpServer', x=-2188.06, y=49.50, z=907.50], vi['arrow'/15, l='MpServer', x=-2118.34, y=54.56, z=1000.00], pk['Painting'/43, l='MpServer', x=-2096.50, y=53.50, z=1084.94], pk['Painting'/13, l='MpServer', x=-2184.06, y=47.50, z=928.50], pk['Painting'/33, l='MpServer', x=-2196.94, y=48.50, z=929.50], pk['Painting'/44, l='MpServer', x=-2096.50, y=52.50, z=1083.94], pk['Painting'/9, l='MpServer', x=-2178.50, y=49.50, z=917.06], vc['§aReese'/31, l='MpServer', x=-2225.50, y=52.00, z=1040.50], pk['Painting'/35, l='MpServer', x=-2188.06, y=49.50, z=907.50], vc['§aAlern'/32, l='MpServer', x=-2209.09, y=48.00, z=907.31], pk['Painting'/33, l='MpServer', x=-2196.94, y=48.50, z=929.50], pk['Painting'/38, l='MpServer', x=-2178.50, y=49.50, z=897.94], pk['Painting'/7, l='MpServer', x=-2169.00, y=49.50, z=916.94], vc['Villager'/39, l='MpServer', x=-2177.34, y=48.00, z=906.34], pk['Painting'/41, l='MpServer', x=-2159.94, y=48.50, z=914.50], pk['Painting'/36, l='MpServer', x=-2188.06, y=49.50, z=907.50], pk['Painting'/5, l='MpServer', x=-2169.00, y=49.50, z=916.94], pk['Painting'/37, l='MpServer', x=-2178.50, y=49.50, z=897.94], pk['Painting'/6, l='MpServer', x=-2161.06, y=49.50, z=921.00], pk['Painting'/43, l='MpServer', x=-2096.50, y=53.50, z=1084.94], pk['Painting'/41, l='MpServer', x=-2159.94, y=48.50, z=914.50], pk['Painting'/44, l='MpServer', x=-2096.50, y=52.50, z=1083.94], bgh['danielgane'/14, l='MpServer', x=-2160.78, y=50.79, z=970.14], vc['Villager'/3170, l='MpServer', x=-2184.00, y=38.00, z=932.84]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bgc.a(SourceFile:297)
	at awp.b(SourceFile:1874)
	at awp.e(SourceFile:686)
	at net.minecraft.client.main.Main.main(SourceFile:104)

-- System Details --
Details:
	Minecraft Version: 13w38b
	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: 131105640 bytes (125 MB) / 464125952 bytes (442 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 24227 (1356712 bytes; 1 MB) allocated, 591 (33096 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 13w38b
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics Family GL version 3.0.0 - Build 8.15.10.2253, Intel
	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: 1611 (90216 bytes; 0 MB) allocated, 118 (6608 bytes; 0 MB) used