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NullReferenceException is thrown when using EditorStyles.wordWrappedLabel inside a ToggleGroup



How to reproduce:
1. Open the project ""
2. Go to Window -> My Window and dock it somewhere
3. In the Project window open Editor/TestEditorScript.cs
4. In the TestEditorScript.cs comment out EditorGUILayout.EndToggleGroup(); line and save it
5. Focus the Editor and observe the error in the Console
6. Uncomment the same line and focus the Editor

Expected result: the error is no longer thrown once the line is uncommented
Actual result: the error remains in the Console

Reproducible with: 2019.2.0a1, 2019.2.21f1, 2019.3.16f1, 2019.4.6f1, 2020.1.0f1, 2020.2.0a19
Could not test with: 2018.4.26f1, 2019.1.0a14, 2019.1.14f1

1. Full error:
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.EditorStyles.get_wordWrappedLabel () (at /Users/builduser/buildslave/unity/build/Editor/Mono/GUI/EditorStyles.cs:41)
TestEditorScript..ctor () (at Assets/Editor/TestEditorScript.cs:6)

2. Versions 2018.4.26f1, 2019.1.14f1 do not throw any NullReferenceExceptions (when the line is commented and when the line is uncommented)

  1. Resolution Note (2020.2.X):

    The core issue here is of trying to access the styles when the domain reload is in progress. At this stage, the style catalog is not available and hence the null reference exceptions. Unfortunately, the design cannot be altered at this point, to make the styles available during a domain reload. Hence we will not be able to fix this
    Also refer to case 1231054 which deals with the same problem

Comments (2)

  1. dennz54

    Jul 29, 2020 07:39

  2. lekanvictorc

    Jul 28, 2020 14:11

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