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Fixed in 2020.2

Fixed in 2018.4, 2019.3, 2020.1



Found in






Issue ID




Null reference exception is thrown when applying modified Button UI component property to prefab

Scene Management


How to reproduce:
1. Open attached project "" and scene "ui_Menu"
2. In Hierarchy window, select a child named "Btn_Purchase"
3. In Inspector window, right click on the "Button (Script)" -> "Modified Component" -> "Apply to prefab 'Screen_PremiumShop' "
4. Observe Console window

Expected result: the prefab modifications are applied
Actual result: errors are thrown

Reproducible with: 2018.4.5f1, 2019.1.13f1, 2019.2.0f1, 2019.3.0a11
Could not test with: 2017.4 due to old prefab system

  1. Response avatar

    Resolution Note (fix version 2020.2):

    Fixed in: 2020.2.0a1

  2. Response avatar

    Resolution Note (fix version 2020.1):

    Fixed in 2020.1.0a26

  3. Response avatar

    Resolution Note (fix version 2019.3):

    Verified in:
    Version 2019.3.9f1

  4. Response avatar

    Resolution Note (fix version 2018.4):

    Verified in:
    Version 2018.4.22f1

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