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  1. Minecraft: Java Edition
  2. MC-192296

Spider Jockey from a spawner minecart crashes with"java.lang.IllegalStateException: Entity is already tracked"

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    Details

    • Type: Bug
    • Status: Resolved
    • Resolution: Fixed
    • Affects Version/s: 1.16.1
    • Fix Version/s: 20w30a
    • Labels:
      None
    • Environment:
      Java 1.8.0_51 64bit
      Memory: 6GB
      CPU: Intel 12 Core i7-8700k @ 3.70GHz
    • Confirmation Status:
      Confirmed
    • Category:
      Crash, Minecart, Mob spawning
    • Mojang Priority:
      Very Important

      Description

      Overview

      When using a spawner minecart with a spider as the spawn potential, it has a chance to spawn a spider jockey, when this happens the game will crash with the error:
      "The game crashed whilst exception ticking world
      Error: java.lang.IllegalStateException: Entity is already tracked!"
      It only effects spawner minecarts not normal spawers

      From testing it looks to only be spider jockeys causing it not any other jockeys

      Recreate
      Summon the following spawner in:

      summon spawner_minecart ~ ~ ~ {SpawnCount:20,MinSpawnDelay:50,MaxSpawnDelay:100,MaxNearbyEntities:100,RequiredPlayerRange:16,SpawnData:{id:"minecraft:spider"}}

      If you summon a few in a give it a minute or 2 the game will crash, when your relog you will see a spider jockey has just been spawned in.

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              Assignee:
              boq [Mojang] Bartosz Bok
              Reporter:
              kruthers kruthers
              Votes:
              10 Vote for this issue
              Watchers:
              5 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved:
                CHK: