I'm running a local MC server, and it will repeatedly crash when trying to generate a world. It seems to generate a little bit more each time the server is relaunched, before crashing again soon after. The only way for the server to generate worlds is if I relaunch it over and over until it finally finishes.
1.13.2: [^crash-2018-11-11_15.40.19-server.txt]
Description: Writing into PalettedContainer from multiple threads
java.lang.IllegalStateException
at bnq.b(SourceFile:43)
at bnq.a(SourceFile:110)
at bnk.a(SourceFile:68)
at bnr.a(SourceFile:168)
at ti.a(SourceFile:217)
at bpa.b(SourceFile:59)
at bpa.a(SourceFile:45)
at btt.a(SourceFile:98)
at bpa.a(SourceFile:66)
at bsp.a(SourceFile:23)
at bsp.a(SourceFile:18)
at bsp.a(SourceFile:10)
at buu.a(SourceFile:24)
at buu.a(SourceFile:13)
at bpn.a(SourceFile:27)
at ayu.a(SourceFile:504)
at bmz.a(SourceFile:113)
at tr.a(SourceFile:12)
at tq.a(SourceFile:35)
at bnd.a(SourceFile:95)
at tx.a(SourceFile:79)
at tx.a(SourceFile:25)
at acu$a.a(SourceFile:147)
at acu$a$$Lambda$1469/484300965.apply(Unknown Source)
at java.util.concurrent.CompletableFuture$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)
Linked issues
Attachments
Comments

MC-132073, rather. Update your Java.
From the crash report:
Java Version: 1.8.0_20, Oracle Corporation
Looks like MC-138125 based on the stacktrace.