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Fixed in 2021.2.X



Found in



Issue ID




NullReferenceException is thrown when drag-and-dropping Prefab into PropertyField-drawn Collection

UI Toolkit


How to reproduce:
1. Open the user's attached "Blank" project
2. Open the "Test -> Editor Window" custom window from the menu
3. Drag-and-drop any Prefab from the Project Browser into the Array in the "Editor Window" custom window

Expected result: Drag-and-dropped Prefab is successfully added into the Array
Actual result: "NullReferenceException: Object reference not set to an instance of an object" is thrown in the Console log

Reproducible with: 2021.2.0a19, 2021.2.12f1
Not reproducible with: 2019.4.36f1, 2020.3.30f1, 2021.2.0a18, 2021.2.13f1, 2021.2.14f1, 2022.1.0b11, 2022.2.0a7

  1. Resolution Note (fix version 2021.2):

    Fixed in 2021.2.13f1

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