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  1. Minecraft: Java Edition
  2. MC-173706

NullPointerException in server tick loop when trying to load a flatland world with Nether biome


    • Icon: Bug Bug
    • Resolution: Fixed
    • 20w11a
    • 20w09a, 20w10a
    • None
    • Community Consensus
    • Crash
    • Very Important

      The bug

      I wanted to load the world from the description of this video in 20w09a: https://www.youtube.com/watch?v=l9oteFEj770

      However, when I tried to open it, the game crashed.

      1.15.2 is able to successfully open the world.

      Stack trace

      Description: Exception in server tick loop
      java.lang.NullPointerException: Exception in server tick loop
      	at com.google.common.base.Preconditions.checkNotNull(Preconditions.java:770)
      	at com.google.common.collect.SingletonImmutableSet.<init>(SingletonImmutableSet.java:47)
      	at com.google.common.collect.ImmutableSet.of(ImmutableSet.java:82)
      	at bny.<init>(SourceFile:16)
      	at bna.a(SourceFile:28)
      	at cef.k(SourceFile:76)
      	at xh.a(SourceFile:175)
      	at blx.<init>(SourceFile:124)
      	at xh.<init>(SourceFile:175)
      	at net.minecraft.server.MinecraftServer.a(SourceFile:403)
      	at egy.a(SourceFile:84)
      	at egy.d(SourceFile:106)
      	at net.minecraft.server.MinecraftServer.run(SourceFile:634)
      	at java.base/java.lang.Thread.run(Thread.java:835)

            boq [Mojang] Bartosz Bok
            violine1101 [Mod] violine1101
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