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Fixed in 2021.2.X



Found in




Issue ID




NullReferenceException thrown when calling GetWindow<>() inside ShowWindow() when called from [InitializeOnLoad] class

UI Toolkit


Reproduction steps:
1. Open the attached project ""
2. In the Project window/Assets folder, create a new script file to cause script recompilation

Expected result: No exceptions are thrown and the "TestWindow" window is shown
Actual result: "System.NullReferenceException: Object reference not set to an instance of an object" exception is thrown and the "TestWindow" window isn't shown

Reproducible with: 2021.1.0a2, 2021.1.2f1, 2021.2.0a3
Not reproducible with: 2018.4.33f1, 2019.4.24f1, 2020.3.3f1, 2021.1.0a1, 2021.2.0a4, 2021.2.0a12

Note: Sometimes it is not necessary to cause recompilation yourself by creating a new script file, recompilation might happen upon opening of the project

  1. Response avatar

    Resolution Note (fix version 2021.2):

    Fixed in 2022.1.0a6

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