Simple Modified Spawners Crash game immediately

Cannot reproduce; I have two edited spawners in my world; one built manually with NBT Explorer and one built with MCEdit. Neither of them crash my game.
Can you attach the schematic?

Where is the crash report?

This is the crash report.

Minecraft Crash Report ----
// Would you like a cupcake?

Time: 7/30/13 7:33 PM
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: (-145,5,-741), Chunk: (at 15,0,11 in -10,-47; contains blocks -160,0,-752 to -145,255,-737), Region: (-1,-2; contains chunks -32,-64 to -1,-33, blocks -512,0,-1024 to -1,255,-513)
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['phoenix7778'/47, l='MpServer', x=-153.05, y=11.63, z=-784.67]]
Chunk stats: MultiplayerChunkCache: 230
Level seed: 0
Level generator: ID 01 - flat, ver 0. Features enabled: false
Level generator options:
Level spawn location: World: (-279,4,-827), Chunk: (at 9,0,5 in -18,-52; contains blocks -288,0,-832 to -273,255,-817), Region: (-1,-2; contains chunks -32,-64 to -1,-33, blocks -512,0,-1024 to -1,255,-513)
Level time: 114961 game time, 18000 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: 7 total; [bdf['phoenix7778'/47, l='MpServer', x=-153.05, y=11.63, z=-784.67], rn['Bat'/42, l='MpServer', x=-182.25, y=8.10, z=-784.72], rn['Bat'/43, l='MpServer', x=-176.25, y=8.10, z=-796.47], rn['Bat'/41, l='MpServer', x=-188.75, y=20.10, z=-805.53], rr['Horse'/46, l='MpServer', x=-122.66, y=5.00, z=-761.38], rn['Bat'/44, l='MpServer', x=-178.25, y=9.10, z=-797.25], rn['Bat'/45, l='MpServer', x=-135.41, y=20.10, z=-740.25]]
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_25, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 188000048 bytes (179 MB) / 382730240 bytes (365 MB) up to 954466304 bytes (910 MB)
JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
AABB Pool Size: 9251 (518056 bytes; 0 MB) allocated, 2 (112 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 2.1.8870, 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: 116 (6496 bytes; 0 MB) allocated, 24 (1344 bytes; 0 MB) used

The Jousting.zip is the world data.

Duplicate of MC-27442.