The game crashes every time the player enters the specific area or load a chunk

Description

While walking around the world the game crashes every time I try to enter a specific area. The mountain looks strange (some blocks are just in the air). I've just walked for 1-2 minutes from my spawn point.

The mountatin looks like: http://joxi.ru/n2Yj0bocZ9303A

The game crashes every time I walk around that area (it's very big - almost all the north and west of my map). Looks like I have a small area for playing around my spawn point.

If I set detalisation 21 chunks, the game crashes as soon as a load it.

Main error message of the launcher

The game crashed whilst exception generating new chunk
Error: java.lang.NullPointerException: Exception generating new chunk

Crash Report

Minecraft Crash Report ----

// You're mean.

Time: 23.04.20 10:43

Description: Exception generating new chunk

java.lang.NullPointerException: Exception generating new chunk

              at caa.a(SourceFile:221)

              at cae.h(SourceFile:62)

              at cae$$Lambda$1095/87865777.doWork(Unknown Source)

              at cae$d.doWork(SourceFile:258)

              at cae.a(SourceFile:214)

              at wp.a(SourceFile:549)

              at wp$$Lambda$3000/1961412652.apply(Unknown Source)

              at com.mojang.datafixers.util.Either$Left.map(Either.java:38)

              at wp.a(SourceFile:543)

              at wp$$Lambda$2997/1057417221.apply(Unknown Source)

              at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952)

              at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926)

              at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)

              at wr.b(SourceFile:58)

              at wr$$Lambda$2937/1685096420.run(Unknown Source)

              at aiv.e(SourceFile:83)

              at aiv.a(SourceFile:123)

              at aiv.run(SourceFile:91)

              at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)

              at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)

              at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)

              at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1689)

              at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)

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

---------------------------------------------------------------------------------------

– Head –

Thread: Server thread

Stacktrace:

              at caa.a(SourceFile:221)

              at cae.h(SourceFile:62)

              at cae$$Lambda$1095/87865777.doWork(Unknown Source)

              at cae$d.doWork(SourceFile:258)

              at cae.a(SourceFile:214)

– Chunk to be generated –

Details:

              Location: -21,-26

              Position hash: -107374182421

              Generator: cca@746024a7

Stacktrace:

              at wp.a(SourceFile:549)

              at wp$$Lambda$3000/1961412652.apply(Unknown Source)

              at com.mojang.datafixers.util.Either$Left.map(Either.java:38)

              at wp.a(SourceFile:543)

              at wp$$Lambda$2997/1057417221.apply(Unknown Source)

              at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952)

              at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926)

              at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)

              at wr.b(SourceFile:58)

              at wr$$Lambda$2937/1685096420.run(Unknown Source)

              at aiv.e(SourceFile:83)

              at aiv.a(SourceFile:123)

              at aiv.run(SourceFile:91)

– Affected level –

Details:

              All players: 1 total; [xe['mathematthew'/70, l='mathematron 2.1', x=-48.39, y=80.00, z=-253.88]]

              Chunk stats: ServerChunkCache: 3559

              Level dimension: minecraft:overworld

              Level name: mathematron 2.1

              Level seed: -1351706945862481889

              Level generator: ID 00 - default, ver 1. Features enabled: true

              Level generator options: {}

              Level spawn location: World: (0,75,80), Chunk: (at 0,4,0 in 0,5; contains blocks 0,0,80 to 15,255,95), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)

              Level time: 1605877 game time, 1274807 day time

              Known server brands: vanilla, forge

              Level was modded: true

              Level storage version: 0x04ABD - Anvil

              Level weather: Rain time: 117178 (now: false), thunder time: 65329 (now: false)

              Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true

Stacktrace:

              at net.minecraft.server.MinecraftServer.b(SourceFile:857)

              at net.minecraft.server.MinecraftServer.a(SourceFile:793)

              at edm.a(SourceFile:130)

              at net.minecraft.server.MinecraftServer.run(SourceFile:655)

              at java.lang.Thread.run(Thread.java:745)

– System Details –

Details:

              Minecraft Version: 1.15.2

              Minecraft Version ID: 1.15.2

              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: 947636664 bytes (903 MB) / 1979711488 bytes (1888 MB) up to 2147483648 bytes (2048 MB)

              CPUs: 8

              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; [xe['mathematthew'/70, l='mathematron 2.1', x=-48.39, y=80.00, z=-253.88]]

              Data Packs: vanilla

              Type: Integrated Server (map_client.txt)

              Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.