---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 5/21/20 3:01 PM
Description: Exception while ticking

java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
	at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
	at yw.a(SourceFile:983)
	at bpa.a(SourceFile:281)
	at bpa.a(SourceFile:351)
	at bwr.d(SourceFile:105)
	at bxe.a(SourceFile:49)
	at cei$a.a(SourceFile:856)
	at yw.b(SourceFile:609)
	at yw$$Lambda$3827/659711812.accept(Unknown Source)
	at bpn.b(SourceFile:84)
	at yw.a(SourceFile:351)
	at net.minecraft.server.MinecraftServer.b(SourceFile:893)
	at net.minecraft.server.MinecraftServer.a(SourceFile:832)
	at enr.a(SourceFile:89)
	at net.minecraft.server.MinecraftServer.run(SourceFile:691)
	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 java.util.HashMap$HashIterator.nextNode(HashMap.java:1429)
	at java.util.HashMap$KeyIterator.next(HashMap.java:1453)
	at yw.a(SourceFile:983)
	at bpa.a(SourceFile:281)
	at bpa.a(SourceFile:351)
	at bwr.d(SourceFile:105)
	at bxe.a(SourceFile:49)
	at cei$a.a(SourceFile:856)
	at yw.b(SourceFile:609)
	at yw$$Lambda$3827/659711812.accept(Unknown Source)

-- Block being ticked --
Details:
	Block location: World: (271,78,-447), Chunk: (at 15,4,1 in 16,-28; contains blocks 256,0,-448 to 271,255,-433), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
Stacktrace:
	at bpn.b(SourceFile:84)
	at yw.a(SourceFile:351)

-- Affected level --
Details:
	All players: 1 total; [yx['misode'/7883, l='ServerLevel[New World]', x=253.32, y=97.58, z=-377.16]]
	Chunk stats: ServerChunkCache: 1744
	Level dimension: custom:icy
	Derived: true
	Level spawn location: World: (32,69,-112), Chunk: (at 0,4,0 in 2,-7; contains blocks 32,0,-112 to 47,255,-97), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 6348 game time, 6348 day time
	Level name: New World
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
	Level weather: Rain time: 167169 (now: false), thunder time: 119056 (now: false)
	Known server brands: vanilla
	Level was modded: false
	Level storage version: 0x04ABD - Anvil
Stacktrace:
	at net.minecraft.server.MinecraftServer.b(SourceFile:893)
	at net.minecraft.server.MinecraftServer.a(SourceFile:832)
	at enr.a(SourceFile:89)
	at net.minecraft.server.MinecraftServer.run(SourceFile:691)
	at java.lang.Thread.run(Thread.java:745)

-- System Details --
Details:
	Minecraft Version: 20w21a
	Minecraft Version ID: 20w21a
	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: 808650560 bytes (771 MB) / 1912602624 bytes (1824 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; [yx['misode'/7883, l='ServerLevel[New World]', x=253.32, y=97.58, z=-377.16]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.