Steps to reproduce:

1. Create a new Unity project using the Universal 3D template
2. Create a new Cube GameObject (GameObject > 3D Object > Cube)
3. Open the Search window by clicking the Search icon in the Hierarchy window
4. Type "Cube" in the search bar in the Search window
5. Save the search to project by clicking the save icon in the Search window
6. Select the saved search in the Project Browser
7. Press the "Refresh" button in the Inspector window for results to show up (due to UUM-112599)
8. Click on the Cube search result in the Inspector window
9. Click the burger icon in the Cube preview at the bottom of the Inspector window
10. Select "Convert to Floating window"
11. Drag the mouse to the Cube in the Floating window
12. Observe the Console window

Actual results: "NullReferenceException: Object reference not set to an instance of an object" error is thrown

Expected results: No errors are thrown

Reproducible with versions: 6000.0.54f1, 6000.1.14f1, 6000.2.0b11, 6000.3.0a1

Not reproducible with versions: 6000.3.0a3

Fixed in version: 6000.3.0a2

Tested on (OS): Ubuntu 24.04, macOS Silicon Sequoia 15.5