How to reproduce:

1. Create and open a new project
2. Ensure the new Hierarchy is enabled (Edit → Preferences→ General → Use new Hierarchy window)
3. Delete all but one GameObject from the scene (for instance, leave only the “Main Camera” in the scene)
4. Select the remaining GameObject in the Hierarchy
5. Wait a second or so (to prevent double-click behavior)
6. Click the remaining GameObject in the Hierarchy again (while it is still selected) to trigger the rename timer
7. Quickly press the “Delete” key before the rename field appears
8. Observe the Console

Actual result: Numerous NullReferenceExceptions appear in the Console
Expected result: No errors appear in the Console

Reproducible with: 6000.4.0a5, 6000.4.3f1, 6000.5.0b4, 6000.6.0a3
Not reproducible in: 6000.3.13f1, 6000.4.0a4
Could not test with: 2023.1.0a4, 6000.0.73f1 (the new Hierarchy was introduced in 6000.3)

Reproducible on: Windows 11
Not reproducible on: No other environments tested

Note: The NullReferenceExceptions stop appearing once a GameObject has been added to the scene