Hopper: java.lang.NullPointerException (SourceFile:110)

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-84/

Crash:

java.lang.NullPointerException
	at abm.a(SourceFile:110)
	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 ----
// This doesn't make any sense!

Time: 8/2/13 8:17 AM
Description: Rendering Tile Entity

java.lang.NullPointerException
	at abm.a(SourceFile:110)
	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:110)
	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: (-413,73,117), Chunk: (at 3,4,5 in -26,7; contains blocks -416,0,112 to -401,255,127), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	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['Jafocake'/192, l='MpServer', x=-413.89, y=74.62, z=115.69]]
	Chunk stats: MultiplayerChunkCache: 10
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (110,64,219), Chunk: (at 14,4,11 in 6,13; contains blocks 96,0,208 to 111,255,223), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 277643 game time, 277643 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; [bdf['Jafocake'/192, l='MpServer', x=-413.89, y=74.62, z=115.69]]
	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 (amd64) version 6.1
	Java Version: 1.7.0_05, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 316810904 bytes (302 MB) / 451543040 bytes (430 MB) up to 954466304 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 18931 (1060136 bytes; 1 MB) allocated, 15 (840 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63
	Launched Version: 1.6.2
	LWJGL: 2.9.0
	OpenGL: Intel(R) HD Graphics GL version 3.1.0 - Build 8.15.10.2696, Intel
	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: 230 (12880 bytes; 0 MB) allocated, 230 (12880 bytes; 0 MB) used

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-84/18292/