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  1. Minecraft: Java Edition
  2. MC-89894

Mobs riding slimes cause the game to crash

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    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Fixed
    • Affects Version/s: Minecraft 15w40b
    • Fix Version/s: Minecraft 15w41b
    • Labels:
      None
    • Environment:
      OS: Windows 7 (ver 6.1, arch amd64)
      Java: 1.8.0_25 (by Oracle Corporation)
      Launcher: Minecraft Launcher 1.6.44 (bootstrap 100)
      Minecraft: 15w40b (updated Wed Sep 30 23:43:54 CST 2015)
    • Confirmation Status:
      Unconfirmed

      Description

      If you summon a slime that is being ridden by another mob using commands, a crash will eventually occur.

      This is my crash report:

      ---- Minecraft Crash Report ----
      // You're mean.
      
      Time: 7/10/15 8:41 AM
      Description: Ticking entity
      
      java.lang.ClassCastException: yq cannot be cast to rs
      	at axt.a(SourceFile:31)
      	at uo.a(SourceFile:172)
      	at uo.a(SourceFile:97)
      	at up.k(SourceFile:236)
      	at up.j(SourceFile:168)
      	at rm.bV(SourceFile:560)
      	at rl.n(SourceFile:1588)
      	at rm.n(SourceFile:409)
      	at rl.m(SourceFile:1456)
      	at rm.m(SourceFile:240)
      	at yq.m(SourceFile:117)
      	at agw.a(SourceFile:1462)
      	at lk.a(SourceFile:705)
      	at agw.g(SourceFile:1440)
      	at agw.k(SourceFile:1330)
      	at lk.k(SourceFile:538)
      	at net.minecraft.server.MinecraftServer.D(SourceFile:618)
      	at net.minecraft.server.MinecraftServer.C(SourceFile:546)
      	at bvr.C(SourceFile:154)
      	at net.minecraft.server.MinecraftServer.run(SourceFile:450)
      	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 --
      Stacktrace:
      	at axt.a(SourceFile:31)
      	at uo.a(SourceFile:172)
      	at uo.a(SourceFile:97)
      	at up.k(SourceFile:236)
      	at up.j(SourceFile:168)
      	at rm.bV(SourceFile:560)
      	at rl.n(SourceFile:1588)
      	at rm.n(SourceFile:409)
      	at rl.m(SourceFile:1456)
      	at rm.m(SourceFile:240)
      	at yq.m(SourceFile:117)
      	at agw.a(SourceFile:1462)
      	at lk.a(SourceFile:705)
      	at agw.g(SourceFile:1440)
      
      -- Entity being ticked --
      Details:
      	Entity Type: Slime (yq)
      	Entity ID: 786
      	Entity Name: Slime
      	Entity's Exact location: -233.81, 64.00, 228.24
      	Entity's Block location: World: (-234,64,228), Chunk: (at 6,4,4 in -15,14; contains blocks -240,0,224 to -225,255,239), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
      	Entity's Momentum: 0.04, -0.08, -0.06
      	Entity's Rider: yc['Creeper'/785, l='Slime Crash World', x=-233.81, y=65.53, z=228.24]
      	Entity's Vehicle: ~~ERROR~~ NullPointerException: null
      Stacktrace:
      	at agw.k(SourceFile:1330)
      	at lk.k(SourceFile:538)
      
      -- Affected level --
      Details:
      	Level name: Slime Crash World
      	All players: 1 total; [lm['Cavinator1'/644, l='Slime Crash World', x=-234.06, y=66.17, z=232.23]]
      	Chunk stats: ServerChunkCache: 272 Drop: 0
      	Level seed: -2266167899765054753
      	Level generator: ID 00 - default, ver 1. Features enabled: true
      	Level generator options: 
      	Level spawn location: World: (-242,64,232), Chunk: (at 14,4,8 in -16,14; contains blocks -256,0,224 to -241,255,239), Region: (-1,0; contains chunks -32,0 to -1,31, blocks -512,0,0 to -1,255,511)
      	Level time: 1677 game time, 14000 day time
      	Level dimension: 0
      	Level storage version: 0x04ABD - Anvil
      	Level weather: Rain time: 48971 (now: false), thunder time: 170183 (now: false)
      	Level game mode: Game mode: creative (ID 1). Hardcore: false. Cheats: true
      Stacktrace:
      	at net.minecraft.server.MinecraftServer.D(SourceFile:618)
      	at net.minecraft.server.MinecraftServer.C(SourceFile:546)
      	at bvr.C(SourceFile:154)
      	at net.minecraft.server.MinecraftServer.run(SourceFile:450)
      	at java.lang.Thread.run(Thread.java:745)
      
      -- System Details --
      Details:
      	Minecraft Version: 15w40b
      	Operating System: Windows 7 (amd64) version 6.1
      	Java Version: 1.8.0_25, Oracle Corporation
      	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
      	Memory: 166171328 bytes (158 MB) / 340983808 bytes (325 MB) up to 1060372480 bytes (1011 MB)
      	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
      	IntCache: cache: 0, tcache: 0, allocated: 12, tallocated: 94
      	Profiler Position: N/A (disabled)
      	Player Count: 1 / 8; [lm['Cavinator1'/644, l='Slime Crash World', x=-234.06, y=66.17, z=232.23]]
      	Type: Integrated Server (map_client.txt)
      	Is Modded: Probably not. Jar signature remains and both client + server brands are untouched.
      

      In the "Entity being ticked" part it says an error under "Entity vehicle."

      Steps to Reproduce:
      1. Use the following commmand to summon a Creeper riding a Slime:
      /summon Creeper ~ ~ ~ {Riding:{id:Slime,Size:3}}
      2. Eventually the game will crash.

      Notes: I have only tested zombies and creepers riding slimes. Other mobs being ridden on (Like a zombie on a skeleton) seem to work fine. I have not tested slimes of smaller or larger sizes or magma cubes.

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            • Assignee:
              Unassigned
              Reporter:
              Cavinator1 Cavinator 1
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              Dates

              • Created:
                Updated:
                Resolved: