Reproduction steps:
1. Open the attached project ”NullReferenceProject”
2. Enter The Play mode
3. Click on the “Next“ button while the circle is expanding
4. Repeat step 3 until “NullReferenceException: Object reference not set to an instance of an object” appears

Expected result: The Scene is changed
Actual result: Error is thrown when the Scene is changed during the Transition Animations

Reproducible with: 2022.1.0a12, 2022.2.13f1
Not reproducible with: 2021.3.22f1, 2022.1.0a11, 2023.1.0a1, 2023.1.0b10, 2023.2.0a9
Couldn’t test with: 2020.3.46f1 - “error CS0246: The type or namespace name 'UIDocument' could not be found“

Reproducible on: Windows 10

Note: The Player freezes after getting the error