crashlog Minecraft

---- Minecraft Crash Report ----
// Who set us up the TNT?

Time: 1/03/19 12:52
Description: Exception in server tick loop

java.util.concurrent.CompletionException: j: Writing into PalettedContainer from multiple threads
	at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:273)
	at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:280)
	at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:961)
	at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:926)
	at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:442)
	at uk.b(SourceFile:57)
	at uk$$Lambda$2410/701073241.run(Unknown Source)
	at afr.f(SourceFile:83)
	at afr.a(SourceFile:123)
	at afr.run(SourceFile:91)
	at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1402)
	at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:289)
	at java.util.concurrent.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1056)
	at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1689)
	at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:157)
Caused by: j: Writing into PalettedContainer from multiple threads
	at ui.a(SourceFile:420)
	at ui$$Lambda$2412/1135484668.apply(Unknown Source)
	at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
	at ui.a(SourceFile:403)
	at ui$$Lambda$2385/976552673.apply(Unknown Source)
	at java.util.concurrent.CompletableFuture.uniCompose(CompletableFuture.java:952)
	... 12 more
Caused by: java.lang.IllegalStateException
	at btl.a(SourceFile:42)
	at btl.a(SourceFile:109)
	at btf.a(SourceFile:60)
	at btf.a(SourceFile:54)
	at btm.a(SourceFile:178)
	at vb.a(SourceFile:230)
	at byo.a(SourceFile:137)
	at byo.a(SourceFile:46)
	at byo.a(SourceFile:16)
	at bvv.a(SourceFile:36)
	at ccl.a(SourceFile:85)
	at ccl$$Lambda$2434/1029378672.accept(Unknown Source)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.util.stream.IntPipeline$4$1.accept(IntPipeline.java:250)
	at java.util.stream.Streams$RangeIntSpliterator.forEachRemaining(Streams.java:110)
	at java.util.Spliterator$OfInt.forEachRemaining(Spliterator.java:693)
	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
	at ccl.a(SourceFile:84)
	at cbn.a(SourceFile:35)
	at bwd.a(SourceFile:20)
	at bwd.a(SourceFile:13)
	at bvv.a(SourceFile:36)
	at bec.a(SourceFile:385)
	at bst.a(SourceFile:125)
	at bsx.c(SourceFile:64)
	at bsx$$Lambda$1050/1684887757.doWork(Unknown Source)
	at bsx$c.doWork(SourceFile:220)
	at bsx.a(SourceFile:184)
	at ui.a(SourceFile:409)
	... 17 more


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

-- System Details --
Details:
	Minecraft Version: 19w09a
	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: 514491464 bytes (490 MB) / 1845493760 bytes (1760 MB) up to 2147483648 bytes (2048 MB)
	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; [uw['JayJay_1989'/283, l='New World', x=837.24, y=74.00, z=-234.01]]
	Data Packs: vanilla
	Type: Integrated Server (map_client.txt)
	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.