Hopper: java.lang.NullPointerException: Ticking entity

This is an automatically generated report based from the following crash: http://hopper.minecraft.net/crashes/minecraft/MCX-1464139/

Crash:

java.lang.NullPointerException: Ticking entity
	at vr.a(SourceFile:62)
	at ue.bu(SourceFile:443)
	at ud.e(SourceFile:1380)
	at ue.e(SourceFile:313)
	at tg.e(SourceFile:119)
	at xt.e(SourceFile:34)
	at ud.j(SourceFile:1248)
	at ue.j(SourceFile:186)
	at akh.a(SourceFile:1343)
	at nz.a(SourceFile:528)
	at akh.g(SourceFile:1321)

The following is the first clean report made public about this crash:

---- Minecraft Crash Report ----
// There are four lights!

Time: 13/03/14 8:25
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
	at vr.a(SourceFile:62)
	at ue.bu(SourceFile:443)
	at ud.e(SourceFile:1380)
	at ue.e(SourceFile:313)
	at tg.e(SourceFile:119)
	at xt.e(SourceFile:34)
	at ud.j(SourceFile:1248)
	at ue.j(SourceFile:186)
	at akh.a(SourceFile:1343)
	at nz.a(SourceFile:528)
	at akh.g(SourceFile:1321)
	at akh.i(SourceFile:1226)
	at nz.i(SourceFile:401)
	at net.minecraft.server.MinecraftServer.w(SourceFile:547)
	at net.minecraft.server.MinecraftServer.v(SourceFile:481)
	at cek.v(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:397)
	at mq.run(SourceFile:667)


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

-- Head --
Stacktrace:
	at vr.a(SourceFile:62)
	at ue.bu(SourceFile:443)
	at ud.e(SourceFile:1380)
	at ue.e(SourceFile:313)
	at tg.e(SourceFile:119)
	at xt.e(SourceFile:34)
	at ud.j(SourceFile:1248)
	at ue.j(SourceFile:186)
	at akh.a(SourceFile:1343)
	at nz.a(SourceFile:528)
	at akh.g(SourceFile:1321)

-- Entity being ticked --
Details:
	Entity Type: Ozelot (yb)
	Entity ID: 139
	Entity Name: Cat
	Entity's Exact location: -380,52, 93,00, 362,30
	Entity's Block location: -381,00,93,00,362,00 - World: (-381,93,362), Chunk: (at 3,5,10 in -24,22; contains blocks -384,0,352 to -369,255,367), 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 akh.i(SourceFile:1226)
	at nz.i(SourceFile:401)

-- Affected level --
Details:
	Level name: EZ
	All players: 1 total; [oc['eloy0912'/204, l='EZ', x=-392,37, y=100,00, z=340,96]]
	Chunk stats: ServerChunkCache: 1150 Drop: 0
	Level seed: 2229
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: -68,00,64,00,256,00 - World: (-68,64,256), Chunk: (at 12,4,0 in -5,16; contains blocks -80,0,256 to -65,255,271), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Level time: 624702 game time, 624702 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 107565 (now: false), thunder time: 12621 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.w(SourceFile:547)
	at net.minecraft.server.MinecraftServer.v(SourceFile:481)
	at cek.v(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:397)
	at mq.run(SourceFile:667)

-- System Details --
Details:
	Minecraft Version: 14w11a
	Operating System: Mac OS X (x86_64) version 10.9.1
	Java Version: 1.6.0_65, Apple Inc.
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Apple Inc.
	Memory: 107752184 bytes (102 MB) / 243458048 bytes (232 MB) up to 1065025536 bytes (1015 MB)
	JVM Flags: 1 total; -Xmx1G
	IntCache: cache: 0, tcache: 17, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [oc['eloy0912'/204, l='EZ', x=-392,37, y=100,00, z=340,96]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.

You can see this full report at http://hopper.minecraft.net/crashes/minecraft/MCX-1464139/67527657/