Search Issue Tracker

Fixed in 2022.1.X



Found in



Issue ID




"BlendTreeWorkspace is NULL" error spam while a BlendTree state is open in Animator Window after saving scene



Steps to reproduce:
1. Open attached "" Unity project
2. Open "test" scene
3. Double-click "New Animator Controller" asset to open the Animator Window
4. Open "Blend Tree" state
5. Create a new object in Hierarchy window to dirty the scene and save scene

Expected result: No errors are thrown
Actual result: Multiple "BlendTreeWorkspace is NULL" errors are thrown while Blend Tree state is open in Animator Window and new errors keep appearing every time the animator window is repainted
BlendTreeWorkspace is NULL
UnityEngine.GUIUtility:ProcessEvent (int,intptr,bool&)

Reproduced with: 2021.2.0b1, 2021.2.0a18
Didn't reproduce on: 2021.2.0a17, 2021.1.13f1, 2020.3.13f1, 2019.4.28f1

Comments (16)

  1. cotevelino

    Oct 19, 2022 22:18

    Why doesn't the LTS have this problem fixed :(

  2. FreakForFreedom

    Oct 18, 2022 15:25

    Still exists in 2021.3.11f1

  3. timmccune

    Oct 17, 2022 00:04

    Exists in Unity 2021.3.5f1 when animator tab is open and inside a blend tree.

  4. hunabku94

    Sep 27, 2022 12:08

    Issue exists in 2021.3.10 too

  5. IC_

    Sep 03, 2022 08:10

    It time to drop unity in favor of something else i think. Unity is a dangling software trying to make all at once and it results to half-made/broken things that worked before

  6. ByErdem

    Sep 01, 2022 07:12

    Issue exists in 2021.3.8f1

  7. paxron

    Aug 13, 2022 09:59

    Issue exists in 2021.3.6f1

  8. bowserscastle

    Jun 11, 2022 20:59

    Seen in 2021.3.1f1

  9. DragonBorn007

    May 14, 2022 01:55

    happens when I save and have the animator tab open with a blend tree in view.

  10. DragonBorn007

    May 14, 2022 01:44

    still getting it in 2021.3.2f1

Add comment

Log in to post comment

All about bugs

View bugs we have successfully reproduced, and vote for the bugs you want to see fixed most urgently.