NPC with AnimationConstraint crashes Studio and hangs live servers

Bug Reports Engine Bugs
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1

An NPC model containing an AnimationConstraint causes Roblox Studio to crash every time it is playtested in any way. The place file contains no scripts, so it only a rigged NPC rig on a baseplate.

Steps to Reproduce

  1. Open the attached CrashRepro.rbxl place file (uploaded as private content)
  2. Press Play (Test/Run mode doesn’t matter)
  3. Studio silently closes the whole window within seconds

Additional Notes

  • Disabling the AnimationConstraint does not help: Even after disabling the AnimationConstraint that appears to be the root cause, Studio still crashes.
  • Live servers also affected: Publishing the place to a live Roblox game and joining from the website causes the server to yield indefinitely until the client connection times out. The server never finishes loading.
  • 100% reproducible: The crash happens every single time I try to playtest the game.
  • Solution: Deleting the AnimationConstraint at workspace.Monster.ColliderPart.AnimationConstraint seems to solve the crashing issue.

My System Information

  • OS: Windows 10 Home 10.0.19045
  • CPU: Intel Core i7-8700K
  • RAM: 64 GB DDR4
  • GPU: NVIDIA GeForce RTX 4080
  • Studio Version: 0.717.0.7170982

A private message is associated with this bug report

2

Thank you for the report. We are investigating and will get back to you.

3

Thanks for your patience! We are rolling out a fix right now which should stop the crash you were seeing Give it about an hour (and you might need to restart studio). Let us know if you are still having a problem after.

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