Crash when leaving Nether.

When leaving Nether: So, I entered Nether, I forgot something so I came back to Overworld and game got crash:

---- Minecraft Crash Report ----
// Don't be sad, have a hug! <3Time: 03.02.19 16:43
Description: Ticking entityjava.lang.NullPointerException: Ticking entity
	at aho.a(SourceFile:1008)
	at aho.dq(SourceFile:997)
	at ahu.dq(SourceFile:70)
	at aho.h(SourceFile:287)
	at ank.h(SourceFile:588)
	at ans.h(SourceFile:72)
	at bcq.a(SourceFile:963)
	at ur.a(SourceFile:365)
	at bcq.f(SourceFile:943)
	at bcq.k_(SourceFile:825)
	at ur.k_(SourceFile:281)
	at net.minecraft.server.MinecraftServer.b(SourceFile:865)
	at net.minecraft.server.MinecraftServer.a(SourceFile:796)
	at dro.a(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:664)
	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 aho.a(SourceFile:1008)
	at aho.dq(SourceFile:997)
	at ahu.dq(SourceFile:70)
	at aho.h(SourceFile:287)
	at ank.h(SourceFile:588)
	at ans.h(SourceFile:72)
	at bcq.a(SourceFile:963)
	at ur.a(SourceFile:365)
	at bcq.f(SourceFile:943)-- Entity being ticked --
Details:
	Entity Type: minecraft:trader_llama (ans)
	Entity ID: 133
	Entity Name: Trader Llama
	Entity's Exact location: 13.20, 72.00, 601.57
	Entity's Block location: World: (13,72,601), Chunk: (at 13,4,9 in 0,37; contains blocks 0,0,592 to 15,255,607), Region: (0,1; contains chunks 0,32 to 31,63, blocks 0,0,512 to 511,255,1023)
	Entity's Momentum: 0.00, -0.08, 0.00
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at bcq.k_(SourceFile:825)
	at ur.k_(SourceFile:281)-- Affected level --
Details:
	Level name: 30 minut dookoła kopalni!
	All players: 1 total; [ut['3meraldK'/96, l='30 minut dookoła kopalni!', x=31.50, y=75.00, z=590.35]]
	Chunk stats: ServerChunkCache: 2986
	Level seed: 5081630163715656906
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: {}
	Level spawn location: World: (-240,71,-191), Chunk: (at 0,4,1 in -15,-12; contains blocks -240,0,-192 to -225,255,-177), Region: (-1,-1; contains chunks -32,-32 to -1,-1, blocks -512,0,-512 to -1,255,-1)
	Level time: 426940 game time, 545014 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 18176 (now: false), thunder time: 77146 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: true. Cheats: false
Stacktrace:
	at net.minecraft.server.MinecraftServer.b(SourceFile:865)
	at net.minecraft.server.MinecraftServer.a(SourceFile:796)
	at dro.a(SourceFile:128)
	at net.minecraft.server.MinecraftServer.run(SourceFile:664)
	at java.lang.Thread.run(Thread.java:745)-- System Details --
Details:
	Minecraft Version: 19w05a
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_51, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 964791376 bytes (920 MB) / 2013265920 bytes (1920 MB) up to 2147483648 bytes (2048 MB)
	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx2G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
	Player Count: 1 / 8; [ut['3meraldK'/96, l='30 minut dookoła kopalni!', x=31.50, y=75.00, z=590.35]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.