Zombies can tick themselves

Zombies randomy will tick, causinf uneccesary stacktrace and sometimes a crash. the Zombies will tick themselves when you poen a wood door.

[19:12:45] [Client thread/INFO]: Setting user: Foltrox
[19:12:47] [Client thread/INFO]: LWJGL Version: 2.9.4
[19:12:48] [Client thread/INFO]: Reloading ResourceManager: Default
[19:12:49] [Sound Library Loader/INFO]: Starting up SoundSystem...
[19:12:49] [Thread-5/INFO]: Initializing LWJGL OpenAL
[19:12:49] [Thread-5/INFO]: (The LWJGL binding of OpenAL.  For more information, see http://www.lwjgl.org)
[19:12:50] [Thread-5/INFO]: OpenAL initialized.
[19:12:50] [Sound Library Loader/INFO]: Sound engine started
[19:12:52] [Client thread/INFO]: Created: 1024x512 textures-atlas
[19:12:57] [Server thread/INFO]: Starting integrated minecraft server version 1.9.1-pre2
[19:12:57] [Server thread/INFO]: Generating keypair
[19:12:58] [Server thread/INFO]: Preparing start region for level 0
[19:12:59] [Server thread/INFO]: Changing view distance to 4, from 10
[19:13:00] [Server thread/INFO]: Foltrox[local:E:5f68d8c5] logged in with entity id 6 at (-230.30000001192093, 5.0, 2147.2054856212562)
[19:13:00] [Server thread/INFO]: Foltrox joined the game
[19:13:00] [Server thread/INFO]: Saving and pausing game...
[19:13:00] [Server thread/INFO]: Saving chunks for level 'Kill Villager'/Overworld
[19:13:00] [Server thread/INFO]: Saving chunks for level 'Kill Villager'/Nether
[19:13:00] [Server thread/INFO]: Saving chunks for level 'Kill Villager'/The End
[19:13:04] [Client thread/WARN]: Something's taking too long! 'root' took aprox 102.455315 ms
[19:13:05] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer' took aprox 100.658826 ms
[19:13:05] [Client thread/WARN]: Something's taking too long! 'root' took aprox 139.466092 ms
[19:13:10] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.gui.debug' took aprox 108.445129 ms
[19:13:10] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.gui' took aprox 116.003072 ms
[19:13:10] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer' took aprox 131.457128 ms
[19:13:10] [Client thread/WARN]: Something's taking too long! 'root' took aprox 133.758594 ms
[19:13:11] [Client thread/WARN]: Something's taking too long! 'root' took aprox 108.222848 ms
[19:13:12] [Client thread/WARN]: Something's taking too long! 'root' took aprox 110.631465 ms
[19:13:15] [Client thread/WARN]: Something's taking too long! 'root.scheduledExecutables' took aprox 132.687084 ms
[19:13:15] [Client thread/WARN]: Something's taking too long! 'root' took aprox 159.223665 ms
[19:13:21] [Client thread/WARN]: Something's taking too long! 'root' took aprox 108.331899 ms
[19:13:21] [Client thread/WARN]: Something's taking too long! 'root' took aprox 102.860741 ms
[19:13:30] [Client thread/INFO]: [CHAT] [Debug]: Hitboxes: shown
[19:13:39] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.level.terrain_setup.update' took aprox 172.588277 ms
[19:13:39] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.level.terrain_setup' took aprox 179.388563 ms
[19:13:39] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.level' took aprox 185.339241 ms
[19:13:39] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer' took aprox 192.734177 ms
[19:13:39] [Client thread/WARN]: Something's taking too long! 'root' took aprox 201.199863 ms
[19:13:44] [Client thread/WARN]: Something's taking too long! 'root' took aprox 108.611935 ms
[19:13:45] [Client thread/WARN]: Something's taking too long! 'root' took aprox 115.337368 ms
[19:13:45] [Client thread/WARN]: Something's taking too long! 'root.tick.level' took aprox 131.367835 ms
[19:13:45] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 141.946903 ms
[19:13:45] [Client thread/WARN]: Something's taking too long! 'root' took aprox 163.66207 ms
[19:13:48] [Client thread/WARN]: Something's taking too long! 'root.display_update' took aprox 171.709411 ms
[19:13:48] [Client thread/WARN]: Something's taking too long! 'root' took aprox 224.798911 ms
[19:13:52] [Client thread/WARN]: Something's taking too long! 'root' took aprox 102.802606 ms
[19:14:03] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.level.entities.entities' took aprox 204.760542 ms
[19:14:03] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.level.entities' took aprox 205.723761 ms
[19:14:03] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer.level' took aprox 211.903179 ms
[19:14:03] [Client thread/WARN]: Something's taking too long! 'root.gameRenderer' took aprox 221.572984 ms
[19:14:03] [Client thread/WARN]: Something's taking too long! 'root' took aprox 222.275164 ms
[19:14:07] [Client thread/WARN]: Something's taking too long! 'root' took aprox 105.074814 ms
[19:14:27] [Client thread/WARN]: Something's taking too long! 'root.display_update' took aprox 214.375631 ms
[19:14:27] [Client thread/WARN]: Something's taking too long! 'root' took aprox 214.792835 ms
[19:14:27] [Client thread/WARN]: Something's taking too long! 'root' took aprox 103.607758 ms
[19:14:37] [Client thread/INFO]: [CHAT] Saved screenshot as 2016-03-10_19.14.37.png
[19:14:37] [Client thread/WARN]: Something's taking too long! 'root.tick.textures' took aprox 550.892716 ms
[19:14:37] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 556.2894 ms
[19:14:37] [Client thread/WARN]: Something's taking too long! 'root' took aprox 570.657508 ms
[19:14:38] [Client thread/WARN]: Something's taking too long! 'root.tick' took aprox 108.095559 ms
[19:14:38] [Client thread/WARN]: Something's taking too long! 'root' took aprox 131.278162 ms
[19:14:40] [Client thread/WARN]: Something's taking too long! 'root' took aprox 110.744315 ms
[19:14:45] [Client thread/WARN]: Something's taking too long! 'root' took aprox 100.73064 ms
[19:15:53] [Server thread/ERROR]: Encountered an unexpected exception
e: Ticking entity
	at net.minecraft.server.MinecraftServer.D(SourceFile:629) ~[1.9.1-pre2.jar:?]
	at net.minecraft.server.MinecraftServer.C(SourceFile:553) ~[1.9.1-pre2.jar:?]
	at byl.C(SourceFile:154) ~[1.9.1-pre2.jar:?]
	at net.minecraft.server.MinecraftServer.run(SourceFile:457) [1.9.1-pre2.jar:?]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_71]
Caused by: java.lang.NullPointerException
	at ayk.c(SourceFile:42) ~[1.9.1-pre2.jar:?]
	at ayp.a(SourceFile:66) ~[1.9.1-pre2.jar:?]
	at ayp.a(SourceFile:40) ~[1.9.1-pre2.jar:?]
	at ayp.a(SourceFile:30) ~[1.9.1-pre2.jar:?]
	at vf.a(SourceFile:110) ~[1.9.1-pre2.jar:?]
	at ve.a(SourceFile:66) ~[1.9.1-pre2.jar:?]
	at tu.a(SourceFile:57) ~[1.9.1-pre2.jar:?]
	at tl.a(SourceFile:94) ~[1.9.1-pre2.jar:?]
	at sb.cm(SourceFile:635) ~[1.9.1-pre2.jar:?]
	at sa.n(SourceFile:1757) ~[1.9.1-pre2.jar:?]
	at sb.n(SourceFile:488) ~[1.9.1-pre2.jar:?]
	at yq.n(SourceFile:41) ~[1.9.1-pre2.jar:?]
	at za.n(SourceFile:243) ~[1.9.1-pre2.jar:?]
	at sa.m(SourceFile:1619) ~[1.9.1-pre2.jar:?]
	at sb.m(SourceFile:276) ~[1.9.1-pre2.jar:?]
	at yq.m(SourceFile:46) ~[1.9.1-pre2.jar:?]
	at za.m(SourceFile:299) ~[1.9.1-pre2.jar:?]
	at aht.a(SourceFile:1516) ~[1.9.1-pre2.jar:?]
	at lp.a(SourceFile:717) ~[1.9.1-pre2.jar:?]
	at aht.g(SourceFile:1494) ~[1.9.1-pre2.jar:?]
	at aht.k(SourceFile:1384) ~[1.9.1-pre2.jar:?]
	at lp.k(SourceFile:550) ~[1.9.1-pre2.jar:?]
	at net.minecraft.server.MinecraftServer.D(SourceFile:625) ~[1.9.1-pre2.jar:?]
	... 4 more
[19:15:54] [Server thread/ERROR]: This crash report has been saved to: C:\Users\Brian\AppData\Roaming\.minecraft\crash-reports\crash-2016-03-10_19.15.54-server.txt
[19:15:54] [Server thread/INFO]: Stopping server
[19:15:54] [Server thread/INFO]: Saving players
[19:15:54] [Server thread/INFO]: Foltrox lost connection: TextComponent{text='Server closed', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[19:15:54] [Server thread/INFO]: Foltrox left the game
[19:15:54] [Server thread/INFO]: Stopping singleplayer server as player logged out
[19:15:54] [Server thread/INFO]: Saving worlds
[19:15:54] [Server thread/INFO]: Saving chunks for level 'Kill Villager'/Overworld
[19:15:54] [Server thread/INFO]: Saving chunks for level 'Kill Villager'/Nether
[19:15:54] [Server thread/INFO]: Saving chunks for level 'Kill Villager'/The End

That was my game freezing, actuel crash:

---- Minecraft Crash Report ----
// Don't do that.

Time: 3/10/16 7:04 PM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
	at vf.m(SourceFile:252)
	at vf.l(SourceFile:189)
	at sb.cm(SourceFile:639)
	at sa.n(SourceFile:1757)
	at sb.n(SourceFile:488)
	at yq.n(SourceFile:41)
	at za.n(SourceFile:243)
	at sa.m(SourceFile:1619)
	at sb.m(SourceFile:276)
	at yq.m(SourceFile:46)
	at za.m(SourceFile:299)
	at aht.a(SourceFile:1516)
	at lp.a(SourceFile:717)
	at aht.g(SourceFile:1494)
	at aht.k(SourceFile:1384)
	at lp.k(SourceFile:550)
	at net.minecraft.server.MinecraftServer.D(SourceFile:625)
	at net.minecraft.server.MinecraftServer.C(SourceFile:553)
	at byl.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:457)
	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 vf.m(SourceFile:252)
	at vf.l(SourceFile:189)
	at sb.cm(SourceFile:639)
	at sa.n(SourceFile:1757)
	at sb.n(SourceFile:488)
	at yq.n(SourceFile:41)
	at za.n(SourceFile:243)
	at sa.m(SourceFile:1619)
	at sb.m(SourceFile:276)
	at yq.m(SourceFile:46)
	at za.m(SourceFile:299)
	at aht.a(SourceFile:1516)
	at lp.a(SourceFile:717)
	at aht.g(SourceFile:1494)

-- Entity being ticked --
Details:
	Entity Type: Zombie (za)
	Entity ID: 7
	Entity Name: Zombie
	Entity's Exact location: -226.18, 5.00, 2139.21
	Entity's Block location: World: (-227,5,2139), Chunk: (at 13,0,11 in -15,133; contains blocks -240,0,2128 to -225,255,2143), Region: (-1,4; contains chunks -32,128 to -1,159, blocks -512,0,2048 to -1,255,2559)
	Entity's Momentum: 0.08, -0.08, -0.02
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at aht.k(SourceFile:1384)
	at lp.k(SourceFile:550)

-- Affected level --
Details:
	Level name: Kill Villager
	All players: 1 total; [lr['Foltrox'/0, l='Kill Villager', x=-230.49, y=5.00, z=2147.24]]
	Chunk stats: ServerChunkCache: 337 Drop: 0
	Level seed: 1358709642
	Level generator: ID 01 - flat, ver 0. Features enabled: true
	Level generator options: 3;minecraft:bedrock;1;village
	Level spawn location: World: (-550,4,2089), Chunk: (at 10,0,9 in -35,130; contains blocks -560,0,2080 to -545,255,2095), Region: (-2,4; contains chunks -64,128 to -33,159, blocks -1024,0,2048 to -513,255,2559)
	Level time: 62073 game time, 62073 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 13196 (now: true), thunder time: 15041 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.D(SourceFile:625)
	at net.minecraft.server.MinecraftServer.C(SourceFile:553)
	at byl.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:457)
	at java.lang.Thread.run(Unknown Source)

-- System Details --
Details:
	Minecraft Version: 1.9.1-pre2
	Operating System: Windows 8 (x86) version 6.2
	Java Version: 1.7.0_71, Oracle Corporation
	Java VM Version: Java HotSpot(TM) Client VM (mixed mode), Oracle Corporation
	Memory: 131287040 bytes (125 MB) / 242348032 bytes (231 MB) up to 510918656 bytes (487 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx500M -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 0, tallocated: 0
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [lr['Foltrox'/0, l='Kill Villager', x=-230.49, y=5.00, z=2147.24]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.