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Found in
2018.4
2019.4
2019.4.19f1
2020.2
2021.1
2021.2
Issue ID
1308539
Regression
No
NullReferenceException when selecting a Dropdown Component override in the Prefab Overrides menu for the second time
How to reproduce:
1. Create a new Unity project
2. Create a new UI Dropdown GameObject
3. Create a Prefab from this dropdown by dragging it into the Project window
4. Select the dropdown instance in the Hierarchy window and change some property
5. Open the Prefab overrides dropdown and select the Dropdown component
6. After it has been selected, select the parent Prefab object and re-select the Dropdown Component
Expected result: no errors are thrown
Actual result: multiple exceptions are thrown
Reproducible with: 2018.4.31f1, 2019.4.19f1, 2020.2.2f1, 2021.1.0b3, 2021.2.0a2
Errors:
NullReferenceException: SerializedObject of SerializedProperty has been Disposed.
GUI Error: You are pushing more GUIClips than you are popping. Make sure they are balanced.
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