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

Time: 6.8.2020 15:15
Description: Ticking player

java.lang.IllegalStateException: Unregistered biome
	at bw.b(SourceFile:88)
	at bw$$Lambda$4571/1385537801.get(Unknown Source)
	at java.util.Optional.orElseThrow(Optional.java:290)
	at bw.a(SourceFile:88)
	at bw.a(SourceFile:68)
	at bx$a.a(SourceFile:55)
	at bx.a(SourceFile:31)
	at bx$$Lambda$4567/825710182.test(Unknown Source)
	at ck.a(SourceFile:62)
	at bx.a(SourceFile:31)
	at aah.v_(SourceFile:484)
	at aay.b(SourceFile:207)
	at nd.a(SourceFile:234)
	at aax.c(SourceFile:173)
	at net.minecraft.server.MinecraftServer.b(SourceFile:881)
	at net.minecraft.server.MinecraftServer.a(SourceFile:810)
	at emy.a(SourceFile:92)
	at net.minecraft.server.MinecraftServer.w(SourceFile:669)
	at net.minecraft.server.MinecraftServer.a(SourceFile:254)
	at net.minecraft.server.MinecraftServer$$Lambda$4168/1344275068.run(Unknown Source)
	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 bw.b(SourceFile:88)
	at bw$$Lambda$4571/1385537801.get(Unknown Source)
	at java.util.Optional.orElseThrow(Optional.java:290)
	at bw.a(SourceFile:88)
	at bw.a(SourceFile:68)
	at bx$a.a(SourceFile:55)
	at bx.a(SourceFile:31)
	at bx$$Lambda$4567/825710182.test(Unknown Source)
	at ck.a(SourceFile:62)
	at bx.a(SourceFile:31)

-- Player being ticked --
Details:
	Entity Type: minecraft:player (aah)
	Entity ID: 1
	Entity Name: mc_da
	Entity's Exact location: 9.50, 92.00, 7.50
	Entity's Block location: World: (9,92,7), Chunk: (at 9,5,7 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Entity's Momentum: 0.00, -0.08, 0.00
	Entity's Passengers: []
	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
Stacktrace:
	at aah.v_(SourceFile:484)
	at aay.b(SourceFile:207)
	at nd.a(SourceFile:234)
	at aax.c(SourceFile:173)
	at net.minecraft.server.MinecraftServer.b(SourceFile:881)
	at net.minecraft.server.MinecraftServer.a(SourceFile:810)
	at emy.a(SourceFile:92)
	at net.minecraft.server.MinecraftServer.w(SourceFile:669)
	at net.minecraft.server.MinecraftServer.a(SourceFile:254)
	at net.minecraft.server.MinecraftServer$$Lambda$4168/1344275068.run(Unknown Source)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 1.16.2 Pre-release 2
	Minecraft Version ID: 1.16.2-pre2
	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: 2047550968 bytes (1952 MB) / 3556769792 bytes (3392 MB) up to 4294967296 bytes (4096 MB)
	CPUs: 8
	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx4G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=64M
	Player Count: 1 / 8; [aah['mc_da'/1, l='ServerLevel[New World]', x=9.50, y=92.00, z=7.50]]
	Data Packs: vanilla, file/data_pack
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.