Hopper: java.lang.NullPointerException

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-4548/

Crash:

java.lang.NullPointerException
	at abm.a(SourceFile:132)
	at abm.h(SourceFile:234)
	at biv.a(SourceFile:22)
	at biv.a(SourceFile:17)
	at biv.a(SourceFile:12)

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// There are four lights!

Time: 8/2/13 9:19 PM
Description: Rendering Tile Entity

java.lang.NullPointerException
	at abm.a(SourceFile:132)
	at abm.h(SourceFile:234)
	at biv.a(SourceFile:22)
	at biv.a(SourceFile:17)
	at biv.a(SourceFile:12)
	at bja.a(SourceFile:106)
	at bja.a(SourceFile:98)
	at bfi.a(SourceFile:333)
	at bfb.a(SourceFile:845)
	at bfb.b(SourceFile:695)
	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 abm.a(SourceFile:132)
	at abm.h(SourceFile:234)
	at biv.a(SourceFile:22)
	at biv.a(SourceFile:17)
	at biv.a(SourceFile:12)

-- Tile Entity Details --
Details:
	Name: MobSpawner // asg
	Block type: ID #52 (tile.mobSpawner // apf)
	Block data value: 0 / 0x0 / 0b0000
	Block location: World: (942,4,-11), Chunk: (at 14,0,5 in 58,-1; contains blocks 928,0,-16 to 943,255,-1), Region: (1,-1; contains chunks 32,-32 to 63,-1, blocks 512,0,-512 to 1023,255,-1)
	Actual block type: ID #52 (tile.mobSpawner // apf)
	Actual block data value: 0 / 0x0 / 0b0000
Stacktrace:
	at bja.a(SourceFile:106)
	at bja.a(SourceFile:98)
	at bfi.a(SourceFile:333)
	at bfb.a(SourceFile:845)

-- Affected level --
Details:
	Level name: MpServer
	All players: 1 total; [bdf['Boing_Man'/124, l='MpServer', x=942.50, y=7.37, z=-11.50]]
	Chunk stats: MultiplayerChunkCache: 140
	Level seed: 0
	Level generator: ID 01 - flat, ver 0. Features enabled: false
	Level generator options: 
	Level spawn location: World: (1048,4,-64), Chunk: (at 8,0,0 in 65,-4; contains blocks 1040,0,-64 to 1055,255,-49), Region: (2,-1; contains chunks 64,-32 to 95,-1, blocks 1024,0,-512 to 1535,255,-1)
	Level time: 2553610 game time, 6823 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: 51 total; [tr['Slime'/0, l='MpServer', x=875.09, y=4.00, z=-68.47], tr['Slime'/1, l='MpServer', x=868.19, y=4.00, z=-29.31], tr['Slime'/2, l='MpServer', x=866.59, y=4.00, z=-24.63], tr['Slime'/3, l='MpServer', x=878.16, y=4.00, z=31.16], tr['Slime'/4, l='MpServer', x=876.94, y=4.00, z=32.22], tr['Slime'/5, l='MpServer', x=888.31, y=4.00, z=-22.28], tr['Slime'/6, l='MpServer', x=882.01, y=4.47, z=-3.94], tr['Slime'/9, l='MpServer', x=919.68, y=4.47, z=-16.21], tr['Slime'/10, l='MpServer', x=922.13, y=4.00, z=-10.69], tr['Slime'/11, l='MpServer', x=920.71, y=4.00, z=30.00], tr['Slime'/12, l='MpServer', x=925.55, y=4.50, z=25.69], tr['Slime'/13, l='MpServer', x=915.67, y=4.50, z=28.85], tr['Slime'/14, l='MpServer', x=922.16, y=4.00, z=60.56], tr['Slime'/17, l='MpServer', x=940.88, y=4.00, z=-5.38], tr['Slime'/16, l='MpServer', x=936.78, y=4.00, z=-10.88], tr['Slime'/19, l='MpServer', x=930.13, y=4.00, z=0.66], tr['Slime'/18, l='MpServer', x=935.57, y=4.47, z=4.94], tr['Slime'/21, l='MpServer', x=937.31, y=4.00, z=46.94], tr['Slime'/20, l='MpServer', x=934.91, y=4.00, z=26.97], tr['Slime'/23, l='MpServer', x=940.42, y=4.00, z=41.42], tr['Slime'/22, l='MpServer', x=936.85, y=4.00, z=41.01], ry['Sheep'/25, l='MpServer', x=955.97, y=4.00, z=-63.09], tr['Slime'/27, l='MpServer', x=958.95, y=4.47, z=27.65], tr['Slime'/26, l='MpServer', x=948.66, y=4.00, z=-2.66], tr['Slime'/28, l='MpServer', x=952.03, y=4.00, z=67.63], ry['Sheep'/31, l='MpServer', x=967.53, y=4.00, z=-64.84], tr['Slime'/34, l='MpServer', x=965.72, y=4.00, z=53.81], tr['Slime'/35, l='MpServer', x=975.13, y=5.16, z=66.44], rp['Chicken'/32, l='MpServer', x=973.41, y=4.00, z=-69.41], tr['Slime'/33, l='MpServer', x=965.13, y=4.00, z=2.25], tr['Slime'/39, l='MpServer', x=980.54, y=4.41, z=-39.59], nz['Experience Orb'/42, l='MpServer', x=31710.00, y=132.00, z=-197.00], bdf['Boing_Man'/124, l='MpServer', x=942.50, y=7.37, z=-11.50], sr['item.item.slimeball'/43, l='MpServer', x=977.41, y=4.13, z=-11.34], rr['Horse'/40, l='MpServer', x=984.00, y=4.00, z=-2.16], rr['Horse'/41, l='MpServer', x=983.41, y=4.00, z=-4.66], tr['Slime'/44, l='MpServer', x=983.63, y=4.00, z=58.25], tr['Slime'/51, l='MpServer', x=1004.31, y=4.00, z=-37.97], tr['Slime'/50, l='MpServer', x=1002.86, y=4.47, z=-33.63], tr['Slime'/49, l='MpServer', x=1007.56, y=4.00, z=-65.38], tr['Slime'/55, l='MpServer', x=1009.22, y=5.22, z=-72.22], tr['Slime'/54, l='MpServer', x=1018.22, y=4.00, z=-67.22], tr['Slime'/53, l='MpServer', x=1000.94, y=4.00, z=17.66], se['Carter'/52, l='MpServer', x=1005.00, y=3.00, z=-19.59], tr['Slime'/59, l='MpServer', x=1021.38, y=4.00, z=26.00], tr['Slime'/58, l='MpServer', x=1022.91, y=4.00, z=-17.31], tr['Slime'/57, l='MpServer', x=1021.88, y=5.16, z=-25.31], tr['Slime'/56, l='MpServer', x=1020.59, y=4.00, z=-32.63], tr['Slime'/779, l='MpServer', x=929.50, y=4.00, z=41.50], od['entity.LeashKnot.name'/121, l='MpServer', x=984.50, y=4.50, z=-5.50], tr['Slime'/60, l='MpServer', x=1010.25, y=4.00, z=63.59]]
	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: 106772424 bytes (101 MB) / 303992832 bytes (289 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 21638 (1211728 bytes; 1 MB) allocated, 1089 (60984 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.6.2
	LWJGL: 2.9.0
	OpenGL: ATI Radeon HD 4200  GL version 3.3.9836 Compatibility Profile Context, ATI Technologies Inc.
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Pack: Default
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 118 (6608 bytes; 0 MB) allocated, 118 (6608 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-4548/158664/