java.lang.NullPointerException: Ticking Entity (Chicken Jockey)

---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 12/20/16 7:47 PM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
	at sn.al(SourceFile:1023)
	at sn.ak(SourceFile:1009)
	at sw.a(SourceFile:203)
	at sn.a(SourceFile:784)
	at sw.g(SourceFile:1585)
	at sw.n(SourceFile:1870)
	at sx.n(SourceFile:499)
	at sk.n(SourceFile:144)
	at ww.n(SourceFile:39)
	at wx.n(SourceFile:82)
	at sw.A_(SourceFile:1703)
	at sx.A_(SourceFile:282)
	at ajs.a(SourceFile:1517)
	at lw.a(SourceFile:718)
	at ajs.h(SourceFile:1495)
	at ajs.k(SourceFile:1378)
	at lw.k(SourceFile:551)
	at net.minecraft.server.MinecraftServer.D(SourceFile:634)
	at net.minecraft.server.MinecraftServer.C(SourceFile:562)
	at cch.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:466)
	at java.lang.Thread.run(Thread.java:745)


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

-- Head --
Thread: Server thread
Stacktrace:
	at sn.al(SourceFile:1023)
	at sn.ak(SourceFile:1009)
	at sw.a(SourceFile:203)
	at sn.a(SourceFile:784)
	at sw.g(SourceFile:1585)
	at sw.n(SourceFile:1870)
	at sx.n(SourceFile:499)
	at sk.n(SourceFile:144)
	at ww.n(SourceFile:39)
	at wx.n(SourceFile:82)
	at sw.A_(SourceFile:1703)
	at sx.A_(SourceFile:282)
	at ajs.a(SourceFile:1517)
	at lw.a(SourceFile:718)
	at ajs.h(SourceFile:1495)

-- Entity being ticked --
Details:
	Entity Type: minecraft:chicken (wx)
	Entity ID: 499
	Entity Name: Chicken
	Entity's Exact location: -100.69, 52.67, 37.24
	Entity's Block location: World: (-101,52,37), Chunk: (at 11,3,5 in -7,2; contains blocks -112,0,32 to -97,255,47), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
	Entity's Momentum: -0.04, -0.11, 0.00
	Entity's Passengers: [aao['Zombie'/500, l='CS_No_8', x=-100.73, y=53.14, z=37.32]]
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at ajs.k(SourceFile:1378)
	at lw.k(SourceFile:551)

-- Affected level --
Details:
	Level name: CS_No_8
	All players: 1 total; [ly['carcass90'/718, l='CS_No_8', x=-61.75, y=64.00, z=-2.28]]
	Chunk stats: ServerChunkCache: 1686 Drop: 0
	Level seed: -7855438045469351367
	Level generator: ID 04 - customized, ver 0. Features enabled: true
	Level generator options: {"coordinateScale":684.412,"heightScale":684.412,"lowerLimitScale":512.0,"upperLimitScale":512.0,"depthNoiseScaleX":200.0,"depthNoiseScaleZ":200.0,"depthNoiseScaleExponent":0.5,"mainNoiseScaleX":80.0,"mainNoiseScaleY":160.0,"mainNoiseScaleZ":80.0,"baseSize":8.5,"stretchY":12.0,"biomeDepthWeight":1.0,"biomeDepthOffset":0.0,"biomeScaleWeight":1.0,"biomeScaleOffset":0.0,"seaLevel":63,"useCaves":true,"useDungeons":true,"dungeonChance":50,"useStrongholds":true,"useVillages":true,"useMineShafts":true,"useTemples":true,"useMonuments":true,"useMansions":true,"useRavines":true,"useWaterLakes":true,"waterLakeChance":4,"useLavaLakes":true,"lavaLakeChance":80,"useLavaOceans":false,"fixedBiome":-1,"biomeSize":4,"riverSize":4,"dirtSize":33,"dirtCount":10,"dirtMinHeight":0,"dirtMaxHeight":256,"gravelSize":33,"gravelCount":8,"gravelMinHeight":0,"gravelMaxHeight":256,"graniteSize":33,"graniteCount":10,"graniteMinHeight":0,"graniteMaxHeight":80,"dioriteSize":33,"dioriteCount":10,"dioriteMinHeight":0,"dioriteMaxHeight":80,"andesiteSize":33,"andesiteCount":10,"andesiteMinHeight":0,"andesiteMaxHeight":80,"coalSize":24,"coalCount":20,"coalMinHeight":0,"coalMaxHeight":128,"ironSize":23,"ironCount":20,"ironMinHeight":0,"ironMaxHeight":102,"goldSize":23,"goldCount":20,"goldMinHeight":0,"goldMaxHeight":111,"redstoneSize":24,"redstoneCount":19,"redstoneMinHeight":0,"redstoneMaxHeight":98,"diamondSize":25,"diamondCount":19,"diamondMinHeight":0,"diamondMaxHeight":93,"lapisSize":25,"lapisCount":14,"lapisCenterHeight":16,"lapisSpread":87}
	Level spawn location: World: (-188,64,-136), Chunk: (at 4,4,8 in -12,-9; contains blocks -192,0,-144 to -177,255,-129), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 5600194 game time, 7010725 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 119451 (now: false), thunder time: 96757 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.D(SourceFile:634)
	at net.minecraft.server.MinecraftServer.C(SourceFile:562)
	at cch.C(SourceFile:154)
	at net.minecraft.server.MinecraftServer.run(SourceFile:466)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 1.11.1
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 252268728 bytes (240 MB) / 563990528 bytes (537 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: 0, tcache: 0, allocated: 12, tallocated: 94
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [ly['carcass90'/718, l='CS_No_8', x=-61.75, y=64.00, z=-2.28]]
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.