Client alway dead after create flat world water preset

Crash log

Description: Exception in server tick loop

java.lang.NullPointerException: Exception in server tick loop
	at aun.a(SourceFile:416)
	at biv.e(SourceFile:59)
	at biv.<init>(SourceFile:45)
	at bil.o(SourceFile:46)
	at rx.o(SourceFile:719)
	at rx.<init>(SourceFile:127)
	at cxd.a(SourceFile:96)
	at cxd.d(SourceFile:131)
	at net.minecraft.server.MinecraftServer.run(SourceFile:502)
	at java.lang.Thread.run(Unknown Source)

Console log

[21:04:21] [Client thread/INFO]: Loaded 0 recipes
[21:04:21] [Client thread/INFO]: Loaded 0 advancements
[21:04:21] [Server thread/INFO]: Starting integrated minecraft server version 18w08a
[21:04:21] [Server thread/INFO]: Generating keypair
[21:04:21] [Server thread/INFO]: Found new data pack vanilla, loading it automatically
[21:04:21] [Server thread/INFO]: Reloading ResourceManager: Default
[21:04:22] [Server thread/INFO]: Loaded 517 recipes
[21:04:23] [Server thread/INFO]: Loaded 560 advancements
[21:04:23] [Server thread/ERROR]: Encountered an unexpected exception
java.lang.NullPointerException: null
	at auh.a(SourceFile:409) ~[minecraft-18w08a-client.jar:?]
	at bip.e(SourceFile:59) ~[minecraft-18w08a-client.jar:?]
	at bip.<init>(SourceFile:45) ~[minecraft-18w08a-client.jar:?]
	at bif.o(SourceFile:46) ~[minecraft-18w08a-client.jar:?]
	at rx.o(SourceFile:719) ~[minecraft-18w08a-client.jar:?]
	at rx.<init>(SourceFile:127) ~[minecraft-18w08a-client.jar:?]
	at cwp.a(SourceFile:96) ~[minecraft-18w08a-client.jar:?]
	at cwp.d(SourceFile:131) ~[minecraft-18w08a-client.jar:?]
	at net.minecraft.server.MinecraftServer.run(SourceFile:502) [minecraft-18w08a-client.jar:?]
	at java.lang.Thread.run(Unknown Source) [?:1.8.0_152]
[21:04:23] [Server thread/ERROR]: This crash report has been saved to: D:\MultiMC\instances\1.12.22\.minecraft\crash-reports\crash-2018-02-23_21.04.23-server.txt
[21:04:23] [Server thread/INFO]: Stopping server
[21:04:23] [Server thread/INFO]: Saving players
[21:04:23] [Server thread/INFO]: Saving worlds

– System Details –
Details:
Minecraft Version: 18w08b
Operating System: Windows 10 (amd64) version 10.0
Java Version: 1.8.0_152, Oracle Corporation
Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
Memory: 2267517320 bytes (2162 MB) / 2825388032 bytes (2694 MB) up to 9544663040 bytes (9102 MB)
JVM Flags: 3 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xms128m -Xmx10240m
Profiler Position: N/A (disabled)
Player Count: 0 / 8; []
Data Packs: vanilla
Type: Integrated Server (map_client.txt)
Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.