Summoning illager near a villager - Second wave raid is loading on at same time - Fatal Ticking Entity crash

See summary. World constantly crashes, unable to recover.

Will attach world download when asked.

Crash report:

---- Minecraft Crash Report ----
// Uh... Did I do that?

Time: 12/12/18 11:34 AM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
	at ash.a(SourceFile:108)
	at asg.k(SourceFile:62)
	at aqk.k(SourceFile:156)
	at ahe.W_(SourceFile:1886)
	at ahf.W_(SourceFile:285)
	at apu.W_(SourceFile:45)
	at bbp.a(SourceFile:1167)
	at uq.a(SourceFile:391)
	at bbp.g(SourceFile:1147)
	at bbp.m_(SourceFile:1029)
	at uq.m_(SourceFile:307)
	at net.minecraft.server.MinecraftServer.b(SourceFile:844)
	at net.minecraft.server.MinecraftServer.a(SourceFile:773)
	at dqk.a(SourceFile:125)
	at net.minecraft.server.MinecraftServer.run(SourceFile:639)
	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: Client thread
Stacktrace:
	at ash.a(SourceFile:108)
	at asg.k(SourceFile:62)
	at aqk.k(SourceFile:156)
	at ahe.W_(SourceFile:1886)
	at ahf.W_(SourceFile:285)
	at apu.W_(SourceFile:45)
	at bbp.a(SourceFile:1167)
	at uq.a(SourceFile:391)
	at bbp.g(SourceFile:1147)

-- Entity being ticked --
Details:
	Entity Type: minecraft:witch (aqk)
	Entity ID: 63
	Entity Name: Witch
	Entity's Exact location: -459.04, 78.94, -232.65
	Entity's Block location: World: (-460,78,-233), Chunk: (at 4,4,7 in -29,-15; contains blocks -464,0,-240 to -449,255,-225), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Entity's Momentum: 0.00, -0.08, 0.00
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at bbp.m_(SourceFile:1029)
	at uq.m_(SourceFile:307)

-- Affected level --
Details:
	Level name: 18w50a
	All players: 1 total; [us['Yellow01'/165, l='18w50a', x=-459.04, y=78.94, z=-232.65]]
	Chunk stats: ServerChunkCache: 7225
	Level seed: 4983639407239914443
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: {}
	Level spawn location: World: (-421,70,-286), Chunk: (at 11,4,2 in -27,-18; contains blocks -432,0,-288 to -417,255,-273), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 10040 game time, 10040 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 59253 (now: false), thunder time: 75078 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
Stacktrace:
	at net.minecraft.server.MinecraftServer.b(SourceFile:844)
	at net.minecraft.server.MinecraftServer.a(SourceFile:773)
	at dqk.a(SourceFile:125)
	at net.minecraft.server.MinecraftServer.run(SourceFile:639)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 18w50a
	Operating System: Mac OS X (x86_64) version 10.10.5
	Java Version: 1.8.0_74, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 1007832256 bytes (961 MB) / 1912602624 bytes (1824 MB) up to 2147483648 bytes (2048 MB)
	JVM Flags: 8 total; -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
	Player Count: 1 / 8; [us['Yellow01'/165, l='18w50a', x=-459.04, y=78.94, z=-232.65]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.
#@!@# Game crashed! Crash report saved to: #@!@# /Users/julianakyzar/Library/Application Support/minecraft/crash-reports/crash-2018-12-12_11.34.33-server.txt
  <log4j:Event logger="net.minecraft.server.MinecraftServer" timestamp="1544636073333" level="INFO" thread="Server thread">
    <log4j:Message><![CDATA[Saving worlds]]></log4j:Message>
  </log4j:Event>