the game crash for no apparent reason

---- Minecraft Crash Report ----
// I bet Cylons wouldn't have this problem.

Time: 31/07/14 10:36
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at aay.l(SourceFile:209)
at aay.k(SourceFile:155)
at xl.bE(SourceFile:450)
at xk.l(SourceFile:1430)
at xl.l(SourceFile:316)
at wn.l(SourceFile:126)
at abr.l(SourceFile:38)
at acc.l(SourceFile:258)
at xk.j(SourceFile:1298)
at xl.j(SourceFile:194)
at aqh.a(SourceFile:1410)
at qo.a(SourceFile:601)
at aqh.g(SourceFile:1388)
at aqh.i(SourceFile:1281)
at qo.i(SourceFile:479)
at net.minecraft.server.MinecraftServer.y(SourceFile:606)
at net.minecraft.server.MinecraftServer.x(SourceFile:530)
at cxc.x(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:446)
at java.lang.Thread.run(Unknown Source)

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

– Head –
Stacktrace:
at aay.l(SourceFile:209)
at aay.k(SourceFile:155)
at xl.bE(SourceFile:450)
at xk.l(SourceFile:1430)
at xl.l(SourceFile:316)
at wn.l(SourceFile:126)
at abr.l(SourceFile:38)
at acc.l(SourceFile:258)
at xk.j(SourceFile:1298)
at xl.j(SourceFile:194)
at aqh.a(SourceFile:1410)
at qo.a(SourceFile:601)
at aqh.g(SourceFile:1388)

– Entity being ticked –
Details:
Entity Type: Rabbit (acc)
Entity ID: 182
Entity Name: Rabbit
Entity's Exact location: -260,09, 68,00, 115,98
Entity's Block location: -261,00,68,00,115,00 - World: (-261,68,115), Chunk: (at 11,4,3 in -17,7; contains blocks -272,0,112 to -257,255,127), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
Entity's Momentum: 0,00, -0,08, 0,00
Entity's Rider: ~_ERROR~ NullPointerException: null
Entity's Vehicle: ~_ERROR~ NullPointerException: null
Stacktrace:
at aqh.i(SourceFile:1281)
at qo.i(SourceFile:479)

– Affected level –
Details:
Level name: The New World
All players: 1 total; [qr['LuMo25'/107, l='The New World', x=-277,48, y=74,00, z=118,36]]
Chunk stats: ServerChunkCache: 603 Drop: 0
Level seed: -5613530295258936875
Level generator: ID 00 - default, ver 1. Features enabled: true
Level generator options:
Level spawn location: 32,00,64,00,256,00 - World: (32,64,256), Chunk: (at 0,4,0 in 2,16; contains blocks 32,0,256 to 47,255,271), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Level time: 4155928 game time, 4693829 day time
Level dimension: 0
Level storage version: 0x04ABD - Anvil
Level weather: Rain time: 9238 (now: false), thunder time: 56164 (now: false)
Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
at net.minecraft.server.MinecraftServer.y(SourceFile:606)
at net.minecraft.server.MinecraftServer.x(SourceFile:530)
at cxc.x(SourceFile:155)
at net.minecraft.server.MinecraftServer.run(SourceFile:446)
at java.lang.Thread.run(Unknown Source)

– System Details –
Details:
Minecraft Version: 14w31a
Operating System: Windows 8 (amd64) version 6.2
Java Version: 1.7.0_65, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 169733592 bytes (161 MB) / 417984512 bytes (398 MB) up to 1060372480 bytes (1011 MB)
JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
IntCache: cache: 1, tcache: 1, allocated: 12, tallocated: 94
Profiler Position: N/A (disabled)
Player Count: 1 / 8; [qr['LuMo25'/107, l='The New World', x=-277,48, y=74,00, z=118,36]]
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.