Crash

---- Minecraft Crash Report ----
// Quite honestly, I wouldn't worry myself about that.

Time: 11/2/13 7:39 AM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
	at abp.a(SourceFile:331)
	at xj.k(SourceFile:203)
	at xl.e(SourceFile:430)
	at blc.e(SourceFile:205)
	at rh.h(SourceFile:1205)
	at xl.h(SourceFile:240)
	at bje.h(SourceFile:63)
	at afn.a(SourceFile:1368)
	at afn.g(SourceFile:1346)
	at afn.h(SourceFile:1253)
	at azd.o(SourceFile:1532)
	at azd.ad(SourceFile:753)
	at azd.e(SourceFile:704)
	at net.minecraft.client.main.Main.main(SourceFile:103)


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

-- Head --
Stacktrace:
	at abp.a(SourceFile:331)
	at xj.k(SourceFile:203)
	at xl.e(SourceFile:430)
	at blc.e(SourceFile:205)
	at rh.h(SourceFile:1205)
	at xl.h(SourceFile:240)
	at bje.h(SourceFile:63)
	at afn.a(SourceFile:1368)
	at afn.g(SourceFile:1346)

-- Entity being ticked --
Details:
	Entity Type: null (bje)
	Entity ID: 541569
	Entity Name: driudwaker
	Entity's Exact location: -132.00, 19.62, 251.00
	Entity's Block location: World: (-132,19,251), Chunk: (at 12,1,11 in -9,15; contains blocks -144,0,240 to -129,255,255), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Entity's Momentum: 0.00, 0.00, 0.00
Stacktrace:
	at afn.h(SourceFile:1253)

-- Affected level --
Details:
	Level name: MpServer
	All players: 5 total; [bje['driudwaker'/541569, l='MpServer', x=-132.00, y=19.62, z=251.00], bld['darkassassin400'/3840, l='MpServer', x=-157.13, y=40.00, z=220.69], bld['sandji21'/4268, l='MpServer', x=-159.25, y=18.95, z=239.86], bld['JKLarsen'/4344, l='MpServer', x=-158.06, y=40.00, z=220.69], bld['PIERRELEFIFOU60'/4311, l='MpServer', x=-163.96, y=18.00, z=261.80]]
	Chunk stats: MultiplayerChunkCache: 121, 121
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: World: (0,73,5), Chunk: (at 0,4,5 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)
	Level time: 606134222 game time, 606175099 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: 13 total; [bld['PIERRELEFIFOU60'/4311, l='MpServer', x=-163.96, y=18.00, z=261.80], bld['sandji21'/4268, l='MpServer', x=-159.25, y=18.95, z=239.86], bld['JKLarsen'/4344, l='MpServer', x=-158.06, y=40.00, z=220.69], xo['arrow'/4596, l='MpServer', x=-150.03, y=20.63, z=238.97], xo['arrow'/4562, l='MpServer', x=-135.06, y=18.00, z=262.63], bld['darkassassin400'/3840, l='MpServer', x=-157.13, y=40.00, z=220.69], bje['driudwaker'/541569, l='MpServer', x=-132.00, y=19.62, z=251.00], bld['PIERRELEFIFOU60'/4311, l='MpServer', x=-163.96, y=18.00, z=261.80], bld['Greenskorpion12'/4399, l='MpServer', x=-159.19, y=39.00, z=213.03], bld['darkassassin400'/3840, l='MpServer', x=-157.13, y=40.00, z=220.69], bld['sandji21'/4268, l='MpServer', x=-159.25, y=18.95, z=239.86], bld['JKLarsen'/4344, l='MpServer', x=-160.94, y=18.00, z=262.00], bld['PIERRELEFIFOU60'/4311, l='MpServer', x=-164.70, y=18.00, z=261.54]]
	Retry entities: 0 total; []
	Server brand: craftbukkit
	Server type: Non-integrated multiplayer server
Stacktrace:
	at biz.a(SourceFile:284)
	at azd.b(SourceFile:1951)
	at azd.e(SourceFile:713)
	at net.minecraft.client.main.Main.main(SourceFile:103)

-- System Details --
Details:
	Minecraft Version: 1.7.2
	Operating System: Windows 7 (x86) version 6.1
	Java Version: 1.7.0_11, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 142440016 bytes (135 MB) / 260014080 bytes (247 MB) up to 1037959168 bytes (989 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 5981 (334936 bytes; 0 MB) allocated, 5 (280 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 1.7.2
	LWJGL: 2.9.0
	OpenGL: ATI Radeon HD 5400 Series GL version 4.0.9901 Compatibility Profile Context, ATI Technologies Inc.
	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: 85 (4760 bytes; 0 MB) allocated, 14 (784 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)