I made a similar report earlier, this one is a Crash that is happening on a Ryzen 3 CPU (Hopefully support model?) 32GB RAM
[02:45:31] [Server thread/ERROR]: Encountered an unexpected exception[02:45:31] [Server thread/ERROR]: Encountered an unexpected exceptionz: Exception generating new chunk at net.minecraft.server.MinecraftServer.b(SourceFile:880) ~[server.jar:?] at aam.b(SourceFile:312) ~[server.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:816) ~[server.jar:?] at net.minecraft.server.MinecraftServer.x(SourceFile:674) ~[server.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:261) ~[server.jar:?] at java.lang.Thread.run(Thread.java:831) [?:?]Caused by: java.util.ConcurrentModificationException at java.util.HashMap.computeIfAbsent(HashMap.java:1225) ~[?:?] at dbw.b(SourceFile:63) ~[server.jar:?] at dbw.a(SourceFile:53) ~[server.jar:?] at dax.<init>(SourceFile:43) ~[server.jar:?] at dam$a.<init>(SourceFile:200) ~[server.jar:?] at dam.a(SourceFile:187) ~[server.jar:?] at dam.a(SourceFile:128) ~[server.jar:?] at dal$a.a(SourceFile:40) ~[server.jar:?] at dal$a.a(SourceFile:31) ~[server.jar:?] at ctk.a(SourceFile:268) ~[server.jar:?] at cqw.a(SourceFile:36) ~[server.jar:?] at clv.a(SourceFile:309) ~[server.jar:?] at clv.a(SourceFile:292) ~[server.jar:?] at clx.e(SourceFile:53) ~[server.jar:?] at clx.a(SourceFile:231) ~[server.jar:?] at aay.a(SourceFile:563) ~[server.jar:?] at com.mojang.datafixers.util.Either$Left.map(Either.java:38) ~[server.jar:?] at aay.a(SourceFile:557) ~[server.jar:?] at java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146) ~[?:?] at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478) ~[?:?] at aba.b(SourceFile:58) ~[server.jar:?] at aqh.f(SourceFile:92) ~[server.jar:?] at aqh.a(SourceFile:132) ~[server.jar:?] at aqh.run(SourceFile:100) ~[server.jar:?] at java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1434) ~[?:?] at java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:295) ~[?:?] at java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1016) ~[?:?] at java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1665) ~[?:?] at java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1598) ~[?:?] at java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:183) ~[?:?][02:45:31] [Server thread/ERROR]: This crash report has been saved to: /home/acg/Server/./crash-reports/crash-2021-05-15_02.45.31-server.txt
Linked issues
duplicates 1
Attachments
Comments 3
Thank you for your report!
We're tracking this issue in MC-149777, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as Fixed. Please check the Fix Version/s field in that ticket to see in which version this behavior was or will be fixed.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki
Regarding your comment, that's in fact a different issue: MC-227537
probably unrelated but this also appears in the logs periodically
java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectSet.remove(Object)" because "☃" is nulljava.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectSet.remove(Object)" because "☃" is null at abe.b(SourceFile:202) ~[server.jar:?] at aay.a(SourceFile:914) ~[server.jar:?] at abj.a(SourceFile:460) ~[server.jar:?] at acd.a(SourceFile:944) ~[server.jar:?] at ua.a(SourceFile:114) ~[server.jar:?] at ua$a.a(SourceFile:42) ~[server.jar:?] at ph.a(SourceFile:21) ~[server.jar:?] at xh.run(SourceFile:18) ~[server.jar:?] at aqe.c(SourceFile:152) ~[server.jar:?] at aqi.c(SourceFile:23) ~[server.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:766) ~[server.jar:?] at net.minecraft.server.MinecraftServer.c(SourceFile:161) ~[server.jar:?] at aqe.z(SourceFile:126) ~[server.jar:?] at net.minecraft.server.MinecraftServer.bd(SourceFile:748) ~[server.jar:?] at net.minecraft.server.MinecraftServer.z(SourceFile:742) ~[server.jar:?] at aqe.bn(SourceFile:111) ~[server.jar:?] at net.minecraft.server.MinecraftServer.y(SourceFile:726) ~[server.jar:?] at net.minecraft.server.MinecraftServer.x(SourceFile:678) ~[server.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:261) ~[server.jar:?] at java.lang.Thread.run(Thread.java:831) [?:?][11:07:17] [Server thread/FATAL]: Error executing task on Serverjava.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.objects.ObjectSet.remove(Object)" because "☃" is null at abe.b(SourceFile:202) ~[server.jar:?] at aay.a(SourceFile:914) ~[server.jar:?] at abj.a(SourceFile:460) ~[server.jar:?] at acd.a(SourceFile:944) ~[server.jar:?] at ua.a(SourceFile:114) ~[server.jar:?] at ua$a.a(SourceFile:42) ~[server.jar:?] at ph.a(SourceFile:21) ~[server.jar:?] at xh.run(SourceFile:18) ~[server.jar:?] at aqe.c(SourceFile:152) ~[server.jar:?] at aqi.c(SourceFile:23) ~[server.jar:?] at net.minecraft.server.MinecraftServer.b(SourceFile:766) ~[server.jar:?] at net.minecraft.server.MinecraftServer.c(SourceFile:161) ~[server.jar:?] at aqe.z(SourceFile:126) ~[server.jar:?] at net.minecraft.server.MinecraftServer.bd(SourceFile:748) ~[server.jar:?] at net.minecraft.server.MinecraftServer.z(SourceFile:742) ~[server.jar:?] at aqe.bn(SourceFile:111) ~[server.jar:?] at net.minecraft.server.MinecraftServer.y(SourceFile:726) ~[server.jar:?] at net.minecraft.server.MinecraftServer.x(SourceFile:678) ~[server.jar:?] at net.minecraft.server.MinecraftServer.a(SourceFile:261) ~[server.jar:?] at java.lang.Thread.run(Thread.java:831) [?:?]