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  1. Minecraft: Java Edition
  2. MC-195544

Game crashes after killing a mob that is being ridden by a guardian which is being ridden by a wither skeleton

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    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Fixed
    • Affects Version/s: 1.16.1, 20w29a, 20w30a
    • Fix Version/s: 1.16.2 Pre-release 1
    • Labels:
      None
    • Confirmation Status:
      Confirmed
    • Category:
      Crash
    • Mojang Priority:
      Very Important

      Description

      The bug

      After killing a mob that is ridden by a guardian while the guardian's being ridden by a wither skeleton, the game crashes as the guardian starts to dismount the entity during its dying animation while it has a wither skeleton above it.

      To reproduce

      1. Run this command
        /summon minecraft:husk ~ ~ ~ {Passengers:[{id:guardian,Passengers:[{id:wither_skeleton}]}]} 
      1. Kill the husk
        it crashes

      Crash report

      1.16.1: crash-2020-07-20_18.15.42-server.txt
      Description: Ticking entity
      
      java.lang.ClassCastException: awx cannot be cast to awu
      	at avl.d(SourceFile:26)
      	at avx.d(SourceFile:50)
      	at auh$$Lambda$4487/946183892.accept(Unknown Source)
      	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
      	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
      	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
      	at java.util.Iterator.forEachRemaining(Iterator.java:116)
      	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
      	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)
      	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
      	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
      	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
      	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
      	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
      	at auh.b(SourceFile:63)
      	at aoz.dO(SourceFile:732)
      	at aoy.k(SourceFile:2505)
      	at aoz.k(SourceFile:538)
      	at bcb.k(SourceFile:42)
      	at bbk.k(SourceFile:127)
      	at aoy.j(SourceFile:2251)
      	at aoz.j(SourceFile:338)
      	at aom.aW(SourceFile:1737)
      	at aoy.aW(SourceFile:2665)
      	at bbk.aW(SourceFile:132)
      	at zd.a(SourceFile:646)
      	at zd.a(SourceFile:654)
      	at zd.a(SourceFile:623)
      	at zd$$Lambda$4254/1032114365.accept(Unknown Source)
      	at bqb.a(SourceFile:603)
      	at zd.a(SourceFile:405)
      	at net.minecraft.server.MinecraftServer.b(SourceFile:873)
      	at net.minecraft.server.MinecraftServer.a(SourceFile:813)
      	at eoz.a(SourceFile:93)
      	at net.minecraft.server.MinecraftServer.v(SourceFile:672)
      	at net.minecraft.server.MinecraftServer.a(SourceFile:256)
      	at net.minecraft.server.MinecraftServer$$Lambda$3784/128204151.run(Unknown Source)
      	at java.lang.Thread.run(Thread.java:745)
      
      
      A detailed walkthrough of the error, its code path and all known details is as follows:
      ---------------------------------------------------------------------------------------
      
      -- Head --
      Thread: Server thread
      Stacktrace:
      	at avl.d(SourceFile:26)
      	at avx.d(SourceFile:50)
      	at auh$$Lambda$4487/946183892.accept(Unknown Source)
      	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
      	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
      	at java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:175)
      	at java.util.Iterator.forEachRemaining(Iterator.java:116)
      	at java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
      	at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:512)
      	at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:502)
      	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
      	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
      	at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
      	at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:418)
      	at auh.b(SourceFile:63)
      	at aoz.dO(SourceFile:732)
      	at aoy.k(SourceFile:2505)
      	at aoz.k(SourceFile:538)
      	at bcb.k(SourceFile:42)
      	at bbk.k(SourceFile:127)
      	at aoy.j(SourceFile:2251)
      	at aoz.j(SourceFile:338)
      	at aom.aW(SourceFile:1737)
      	at aoy.aW(SourceFile:2665)
      	at bbk.aW(SourceFile:132)
      	at zd.a(SourceFile:646)
      	at zd.a(SourceFile:654)
      	at zd.a(SourceFile:623)
      	at zd$$Lambda$4254/1032114365.accept(Unknown Source)
      
      -- Entity being ticked --
      Details:
      	Entity Type: minecraft:husk (bby)
      	Entity ID: 226
      	Entity Name: Husk
      	Entity's Exact location: 18.74, 4.00, 17.06
      	Entity's Block location: World: (18,4,17), Chunk: (at 2,0,1 in 1,1; contains blocks 16,0,16 to 31,255,31), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
      	Entity's Momentum: 0.00, -0.08, 0.00
      	Entity's Passengers: []
      	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
      Stacktrace:
      	at bqb.a(SourceFile:603)
      	at zd.a(SourceFile:405)
      
      -- Affected level --
      Details:
      	All players: 1 total; [ze['drownedzombie00'/1, l='ServerLevel[New World]', x=17.29, y=4.00, z=10.99]]
      	Chunk stats: ServerChunkCache: 2209
      	Level dimension: minecraft:overworld
      	Level spawn location: World: (0,4,0), Chunk: (at 0,0,0 in 0,0; contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
      	Level time: 107906 game time, 6000 day time
      	Level name: New World
      	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
      	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
      	Known server brands: vanilla
      	Level was modded: false
      	Level storage version: 0x04ABD - Anvil
      Stacktrace:
      	at net.minecraft.server.MinecraftServer.b(SourceFile:873)
      	at net.minecraft.server.MinecraftServer.a(SourceFile:813)
      	at eoz.a(SourceFile:93)
      	at net.minecraft.server.MinecraftServer.v(SourceFile:672)
      	at net.minecraft.server.MinecraftServer.a(SourceFile:256)
      	at net.minecraft.server.MinecraftServer$$Lambda$3784/128204151.run(Unknown Source)
      	at java.lang.Thread.run(Thread.java:745)
      
      -- System Details --
      Details:
      	Minecraft Version: 1.16.1
      	Minecraft Version ID: 1.16.1
      	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: 2799584808 bytes (2669 MB) / 3590324224 bytes (3424 MB) up to 7516192768 bytes (7168 MB)
      	CPUs: 4
      	JVM Flags: 9 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss1M -Xmx7G -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M
      	Player Count: 1 / 8; [ze['drownedzombie00'/1, l='ServerLevel[New World]', x=17.29, y=4.00, z=10.99]]
      	Data Packs: vanilla
      	Type: Integrated Server (map_client.txt)
      	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.
      
      

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            People

            Assignee:
            cojomax99 [Mojang] Cory Scheviak
            Reporter:
            drownedzombie01 [Mod] DrownedZombie
            Votes:
            8 Vote for this issue
            Watchers:
            5 Start watching this issue

              Dates

              Created:
              Updated:
              Resolved:
              CHK: