Hopper: java.lang.NullPointerException

java.lang.NullPointerException
	at ol.b(SourceFile:123)

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 2013/9/21 下午 7:51
Description: Saving entity NBT

java.lang.NullPointerException
	at ol.b(SourceFile:123)
	at nn.e(SourceFile:1003)
	at nn.d(SourceFile:982)
	at abn.a(SourceFile:110)
	at abn.h(SourceFile:234)
	at biy.a(SourceFile:22)
	at biy.a(SourceFile:17)
	at biy.a(SourceFile:12)
	at bjd.a(SourceFile:106)
	at bjd.a(SourceFile:98)
	at bfl.a(SourceFile:333)
	at bfe.a(SourceFile:845)
	at bfe.b(SourceFile:695)
	at atv.S(SourceFile:686)
	at atv.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 ol.b(SourceFile:123)

-- Entity being saved --
Details:
	Entity Type: Painting (ol)
	Entity ID: 422
	Entity Name: 繪畫
	Entity's Exact location: 0.00, 0.00, 0.00
	Entity's Block location: 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)
	Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
	at nn.e(SourceFile:1003)
	at nn.d(SourceFile:982)
	at abn.a(SourceFile:110)
	at abn.h(SourceFile:234)
	at biy.a(SourceFile:22)
	at biy.a(SourceFile:17)
	at biy.a(SourceFile:12)

-- Tile Entity Details --
Details:
	Name: MobSpawner // asj
	Block type: ID #52 (tile.mobSpawner // api)
	Block data value: 2 / 0x2 / 0b0010
	Block location: World: (-67,159,206), Chunk: (at 13,9,14 in -5,12; contains blocks -80,0,192 to -65,255,207), 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 // api)
	Actual block data value: 2 / 0x2 / 0b0010
Stacktrace:
	at bjd.a(SourceFile:106)
	at bjd.a(SourceFile:98)
	at bfl.a(SourceFile:333)
	at bfe.a(SourceFile:845)

-- Affected level --
Details:
	Level name: MpServer
	All players: 2 total; [bdi['winnie2908'/438025, l='MpServer', x=-22.57, y=158.62, z=160.16], bey['ysesst19'/424029, l='MpServer', x=106.09, y=150.00, z=41.23]]
	Chunk stats: MultiplayerChunkCache: 441
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (87,150,52), Chunk: (at 7,9,4 in 5,3; contains blocks 80,0,48 to 95,255,63), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 31208 game time, 38785 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: survival (ID 0). Hardcore: false. Cheats: false
	Forced entities: 41 total; [bdi['winnie2908'/438025, l='MpServer', x=-22.57, y=158.62, z=160.16], bey['ysesst19'/424029, l='MpServer', x=106.09, y=150.00, z=41.23], tt['蜘蛛'/443073, l='MpServer', x=-77.50, y=158.00, z=197.50], tw['殭屍'/442284, l='MpServer', x=-83.78, y=158.00, z=180.64], tw['殭屍'/438218, l='MpServer', x=-81.25, y=158.00, z=210.06], ub['村民'/6, l='MpServer', x=-35.88, y=159.00, z=155.69], tw['殭屍'/438217, l='MpServer', x=-84.00, y=158.00, z=207.91], ub['村民'/438026, l='MpServer', x=-92.50, y=159.00, z=157.50], bey['ysesst19'/424029, l='MpServer', x=106.09, y=150.00, z=41.23], ub['村民'/438027, l='MpServer', x=-92.50, y=159.00, z=180.50], ub['村民'/424031, l='MpServer', x=-68.50, y=159.00, z=184.50], tt['蜘蛛'/438684, l='MpServer', x=-58.19, y=158.00, z=150.75], tt['蜘蛛'/439493, l='MpServer', x=-49.97, y=158.00, z=212.38], ub['村民'/438028, l='MpServer', x=-89.50, y=159.00, z=215.50], tw['殭屍'/439495, l='MpServer', x=-81.19, y=158.00, z=208.56], tt['蜘蛛'/438239, l='MpServer', x=-51.44, y=158.00, z=216.03], tr['骷髏'/438236, l='MpServer', x=-45.50, y=158.17, z=222.50], tt['蜘蛛'/438235, l='MpServer', x=-45.50, y=158.00, z=222.50], tw['殭屍'/438365, l='MpServer', x=-36.88, y=159.00, z=157.50], tt['蜘蛛'/442289, l='MpServer', x=-84.50, y=158.00, z=192.50], tf['苦力怕'/438489, l='MpServer', x=-37.50, y=158.00, z=203.50], tt['蜘蛛'/442292, l='MpServer', x=-85.13, y=158.00, z=196.00], tr['骷髏'/439132, l='MpServer', x=-32.50, y=158.00, z=203.50], tw['殭屍'/440560, l='MpServer', x=23.50, y=150.00, z=94.50], tf['苦力怕'/439128, l='MpServer', x=-25.94, y=158.00, z=201.72], tf['苦力怕'/439129, l='MpServer', x=-31.50, y=158.00, z=208.50], tf['苦力怕'/438245, l='MpServer', x=-44.50, y=158.00, z=219.50], tf['苦力怕'/439126, l='MpServer', x=-72.50, y=158.00, z=176.50], tf['苦力怕'/438244, l='MpServer', x=-42.50, y=158.00, z=219.50], tr['骷髏'/438178, l='MpServer', x=-28.50, y=158.00, z=209.50], tf['苦力怕'/439125, l='MpServer', x=-72.50, y=158.00, z=174.50], tt['蜘蛛'/439122, l='MpServer', x=-75.00, y=158.00, z=166.06], tr['骷髏'/439677, l='MpServer', x=-68.47, y=158.00, z=215.44], tf['苦力怕'/443253, l='MpServer', x=-42.75, y=158.00, z=179.06], tt['蜘蛛'/439120, l='MpServer', x=-72.50, y=158.00, z=180.50], tw['殭屍'/428837, l='MpServer', x=25.28, y=150.00, z=105.84], tw['殭屍'/439648, l='MpServer', x=-55.59, y=158.00, z=190.69], tf['苦力怕'/443247, l='MpServer', x=-47.50, y=158.00, z=173.50], tw['殭屍'/443069, l='MpServer', x=-85.27, y=158.50, z=180.47], tr['骷髏'/439658, l='MpServer', x=-63.50, y=158.00, z=156.50], tf['苦力怕'/440556, l='MpServer', x=32.50, y=150.00, z=96.50]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Non-integrated multiplayer server
Stacktrace:
	at bdd.a(SourceFile:284)
	at atv.b(SourceFile:1761)
	at atv.d(SourceFile:628)
	at net.minecraft.client.main.Main.main(SourceFile:101)

-- System Details --
Details:
	Minecraft Version: 1.6.4
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_21, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode, sharing), Oracle Corporation
	Memory: 31414400 bytes (29 MB) / 110866432 bytes (105 MB) up to 518979584 bytes (494 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx512M
	AABB Pool Size: 15875 (889000 bytes; 0 MB) allocated, 655 (36680 bytes; 0 MB) used
	Suspicious classes: No suspicious classes found.
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Launched Version: 1.6.4
	LWJGL: 2.9.0
	OpenGL: ATI Mobility Radeon HD 5470 GL version 3.2.9262 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: faithful32pack (1)
	Current Language: 繁體中文 (台灣)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 431 (24136 bytes; 0 MB) allocated, 121 (6776 bytes; 0 MB) used