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  1. Minecraft: Java Edition
  2. MC-190328

World crashes after changing difficulty: java.util.concurrent.CompletionException: s: Exception generating new chunk

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    Details

    • Type: Bug
    • Status: Open
    • Resolution: Unresolved
    • Affects Version/s: 1.16 Pre-release 8
    • Fix Version/s: None
    • Labels:
      None
    • Confirmation Status:
      Unconfirmed
    • Category:
      Crash

      Description

      World created in 1.16-pre8, shortly after opening it I changed the difficulty, and the game crashed.

      This happened while I was inside of the options menu in singleplayer (no LAN), so the world was paused.

      World seed: 6456309125617517717

      Stack trace

      Description: Exception in server tick loop
      
      java.util.concurrent.CompletionException: s: Exception generating new chunk
      	at java.base/java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:314)
      	at java.base/java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:319)
      	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1155)
      	at java.base/java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:478)
      	at yr.b(SourceFile:58)
      	at amq.e(SourceFile:94)
      	at amq.a(SourceFile:137)
      	at amq.run(SourceFile:105)
      	at java.base/java.util.concurrent.ForkJoinTask$RunnableExecuteAction.exec(ForkJoinTask.java:1425)
      	at java.base/java.util.concurrent.ForkJoinTask.doExec(ForkJoinTask.java:290)
      	at java.base/java.util.concurrent.ForkJoinPool$WorkQueue.topLevelExec(ForkJoinPool.java:1020)
      	at java.base/java.util.concurrent.ForkJoinPool.scan(ForkJoinPool.java:1656)
      	at java.base/java.util.concurrent.ForkJoinPool.runWorker(ForkJoinPool.java:1594)
      	at java.base/java.util.concurrent.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:177)
      Caused by: s: Exception generating new chunk
      	at yp.a(SourceFile:579)
      	at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
      	at yp.a(SourceFile:562)
      	at java.base/java.util.concurrent.CompletableFuture$UniCompose.tryFire(CompletableFuture.java:1146)
      	... 11 more
      Caused by: java.util.ConcurrentModificationException
      	at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134)
      	at cva.b(SourceFile:64)
      	at cva.a(SourceFile:54)
      	at com.mojang.datafixers.util.Either$Left.map(Either.java:38)
      	at cqc.a(SourceFile:98)
      	at cqc.a(SourceFile:131)
      	at cpz.a(SourceFile:260)
      	at cjs.a(SourceFile:40)
      	at cjp$a.a(SourceFile:43)
      	at cjp$a.a(SourceFile:34)
      	at cml.a(SourceFile:249)
      	at ckc.a(SourceFile:27)
      	at cha.a(SourceFile:268)
      	at cha.a(SourceFile:259)
      	at chc.d(SourceFile:51)
      	at chc.a(SourceFile:219)
      	at yp.a(SourceFile:568)
      	... 14 more
      

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              Assignee:
              Unassigned Unassigned
              Reporter:
              violine1101 [Mod] violine1101
              Votes:
              1 Vote for this issue
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                Dates

                Created:
                Updated: