---- Minecraft Crash Report ----
// Why did you do that?

Time: 04.04.20, 20:04
Description: Exception generating new chunk

java.util.ConcurrentModificationException
	at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134)
	at cmo.b(SourceFile:67)
	at cmo.a(SourceFile:57)
	at clq$a.a(SourceFile:102)
	at clq$a.<init>(SourceFile:82)
	at clq.a(SourceFile:67)
	at cfc$a.a(SourceFile:65)
	at caa.a(SourceFile:199)
	at cae.d(SourceFile:51)
	at cae.a(SourceFile:214)
	at wp.a(SourceFile:549)
	at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
	at wp.a(SourceFile:543)
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146)
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478)
	at wr.b(SourceFile:58)
	at aiv.e(SourceFile:83)
	at aiv.a(SourceFile:123)
	at aiv.run(SourceFile:91)
	at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1425)
	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)


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

-- Head --
Thread: Server thread
Stacktrace:
	at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134)
	at cmo.b(SourceFile:67)
	at cmo.a(SourceFile:57)
	at clq$a.a(SourceFile:102)
	at clq$a.<init>(SourceFile:82)
	at clq.a(SourceFile:67)
	at cfc$a.a(SourceFile:65)
	at caa.a(SourceFile:199)
	at cae.d(SourceFile:51)
	at cae.a(SourceFile:214)

-- Chunk to be generated --
Details:
	Location: 133,-15
	Position hash: -64424509307
	Generator: cca@4ae1a8f9
Stacktrace:
	at wp.a(SourceFile:549)
	at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
	at wp.a(SourceFile:543)
	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146)
	at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478)
	at wr.b(SourceFile:58)
	at aiv.e(SourceFile:83)
	at aiv.a(SourceFile:123)
	at aiv.run(SourceFile:91)
	at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1425)

-- Affected level --
Details:
	All players: 1 total; [xe['violine1101'/451, l='Villaging World', x=1792.66, y=62.07, z=-147.62]]
	Chunk stats: ServerChunkCache: 4221
	Level dimension: minecraft:overworld
	Level name: Villaging World
	Level seed: 5350435184536654693
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: {}
	Level spawn location: World: (224,69,-96), Chunk: (at 0,4,0 in 14,-6; contains blocks 224,0,-96 to 239,255,-81), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 14809937 game time, 24011074 day time
	Known server brands: vanilla
	Level was modded: false
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 51084 (now: false), thunder time: 78721 (now: false)
	Level game mode: Game mode: survival (ID 0). Hardcore: false. Cheats: false
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.base/java.lang.Thread.run(Thread.java:835)

-- System Details --
Details:
	Minecraft Version: 1.15.2
	Minecraft Version ID: 1.15.2
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 12.0.1, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode, sharing), Oracle Corporation
	Memory: 792228776 bytes (755 MB) / 1811939328 bytes (1728 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['violine1101'/451, l='Villaging World', x=1792.66, y=62.07, z=-147.62]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.