Crash: Exception generating new chunk

---- Minecraft Crash Report ----
// Everything's going to plan. No, really, that was supposed to happen.

Time: 09/02/18 13:51
Description: Exception generating new chunk

java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException
	at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2237)
	at rz.c(SourceFile:130)
	at sg.a(SourceFile:84)
	at sh.c(SourceFile:144)
	at sa.k_(SourceFile:221)
	at net.minecraft.server.MinecraftServer.w(SourceFile:695)
	at net.minecraft.server.MinecraftServer.v(SourceFile:628)
	at cvl.v(SourceFile:155)
	at net.minecraft.server.MinecraftServer.run(SourceFile:533)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.util.ConcurrentModificationException
	at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
	at java.util.ArrayList$Itr.next(ArrayList.java:851)
	at bpa.a(SourceFile:55)
	at bkz$a.a(SourceFile:115)
	at bly.a(SourceFile:92)
	at bny.a(SourceFile:16)
	at bny.a(SourceFile:13)
	at bit.a(SourceFile:27)
	at aud.a(SourceFile:416)
	at bif.b(SourceFile:122)
	at sn.a(SourceFile:13)
	at sm.a(SourceFile:34)
	at bgq.a(SourceFile:89)
	at sr.a(SourceFile:54)
	at sr.a(SourceFile:23)
	at zo$a.a(SourceFile:143)
	at zo$a$$Lambda$882/1704220437.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture$AsyncApply.exec(CompletableFuture.java:501)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:902)
	at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1689)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1644)
	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 rz.a(SourceFile:180)

-- Chunk to be generated --
Details:
	Location: 80,-17
	Position hash: -73014443952
	Generator: bif@69875dd1
Stacktrace:
	at rz.a(SourceFile:180)
	at rz.c(SourceFile:133)
	at sg.a(SourceFile:84)
	at sh.c(SourceFile:144)
	at sa.k_(SourceFile:221)
	at net.minecraft.server.MinecraftServer.w(SourceFile:695)
	at net.minecraft.server.MinecraftServer.v(SourceFile:628)
	at cvl.v(SourceFile:155)
	at net.minecraft.server.MinecraftServer.run(SourceFile:533)
	at java.lang.Thread.run(Thread.java:745)

-- Affected level --
Details:
	Level name: generate snapshot
	All players: 1 total; [sc['mariohessel'/281, l='generate snapshot', x=1093.86, y=70.24, z=-409.13]]
	Chunk stats: ServerChunkCache: 1035 Drop: 0
	Level seed: -2484772713405290736
	Level generator: ID 00 - default, ver 1. Features enabled: true
	Level generator options: 
	Level spawn location: World: (8,64,136), Chunk: (at 8,4,8 in 0,8; contains blocks 0,0,128 to 15,255,143), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
	Level time: 17173 game time, 3805 day time
	Level dimension: 0
	Level storage version: 0x04ABD - Anvil
	Level weather: Rain time: 125660 (now: false), thunder time: 135964 (now: false)
	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true

-- System Details --
Details:
	Minecraft Version: 18w06a
	Operating System: Windows 10 (amd64) version 10.0
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 158193904 bytes (150 MB) / 822083584 bytes (784 MB) up to 1073741824 bytes (1024 MB)
	JVM Flags: 8 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=16M
	Profiler Position: N/A (disabled)
	Player Count: 1 / 8; [sc['mariohessel'/281, l='generate snapshot', x=1093.86, y=70.24, z=-409.13]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.