Search Issue Tracker

Fixed in 2019.1.X



Found in



Issue ID




Unity throws "SendMessage cannot be called during Awake, CheckConsistency, or OnValidate" Warning when manipulating the UI



To reproduce:

1. Download attached project “" and open in Unity
2. Open "SampleScene" scene
3. In Hierarchy select UI > Canvas > Parent > Slider
4. In Inspector modify Slider Value

Expected results: No Warning or Error are printed in Console
Actual results: Console spams "SendMessage cannot be called during Awake, CheckConsistency, or OnValidate" Warnings with each modification

- This issue appears on Windows, macOS and Linux
- Link to the project is attached in Comments section
- A Video which shows how to reproduce the issue is attached in Comments section

Reproduced on Unity 2019.3.0a12, 2017.4.0f1, 2017.4.20f2, 2018.3.7f1, 2019.1.0a4

Comments (4)

  1. bourriquet

    Jun 20, 2020 23:06

    A buyer of my code asset has this problem too with Unity 2019.3.13, but I cannot reproduce it. It might have to do with some other settings. It comes from a LoadAssetAtPath call in a OnGUI function in a Custom Drawer script.

  2. stjernerlever

    Mar 04, 2020 09:42

    Just updated my project from 2018.3 to 2019.3 and started receiving this error. Points to an OnValidate function, although it seems to be carrying out its function as intended.


    Feb 19, 2020 05:06

    Unity 2019.3.1f1 the message here again. They are appearing mainly while project just opening. Some of them had call stack that lead to custom ScriptableObject or Prefab assets where our scripts accessed some singleton editor setting assets via AssetDatabase.LoadAssetAtPath(). So, I reworked these OnValidate to delay the validation during cold start. But there are still a lot of such messages with no call stack behind. So, I have no idea are they related to my assets or system ones.

  4. Gladyon

    Feb 04, 2020 12:53

    Could you please really fix the problem please?

    I am using Unity 2019.2.17f1 and it's still there.

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.