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Issue ID




"ReferenceException" Errors are thrown when interacting with custom UI element after scene change



How to reproduce:
1. Open attached project "" and scene "SampleScene"
2. Open scene "Test1"
3. Click on the Button in the Scene view
4. Observe the Console

Expected result: No errors in the Console
Actual result: One of two errors are thrown/spammed in the Console

Reproducible with: 2018.4.25f1, 2019.4.4f1, 2020.1.0b16, 2020.2.0a18

-From version 2018.4.25f1 to 2019.3.0b9 and from 2020.1.0a15 to 2020.2.0a18 error "NullReferenceException: Object reference not set to an instance of an object HorizontalDropdown.OnDestroy ()" is thrown
-From version 2019.3.0b10 to 2020.1.0a14 error "MissingReferenceException: The object of type 'HorizontalDropdown' has been destroyed but you are still trying to access it." is being spammed
-This issue also reproduces on macOS

  1. Resolution Note (2020.2.X):

    The issue is the user is accessing a null object which then prevents some things from deregistering as the null stops execution. Their OnDestroy call doesn't ensure that either button is still present. Resolving that null reference exception i dont see a further issue...

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