Steps to reproduce:

1. Create a 3D project
2. Add any 3D game object for example "Cube"
3. Go to the "Window" menu and select "Search" ->"New Window"
4. In the "Search" window click the "Inspector" button and verify that the "Inspector" section becomes visible
5. Type "Cube" into the search input section and click "Enter"
6. Observe results in the "All" tab, find "Cube" and select it
7. Verify, that the "Inspector" section displays its data
8. Click the save (diskette) button displayed in the "Search" window 
9. Select the "Save Project" option
10. Leave the default proposed name and click "Save"
11. Observe "Console", it displays an error.

Expected result: The query should be saved with no errors in the console.

Actual result:  The query is saved, but the console displays an error.

Reproducible with: 2023.1.0a15, 2023.1.0b10, 2023.2.0a9.

Not reproducible with: 2023.1.0a14, 2022.2.13f1, 2021.3.22f1, 2020.3.46f1 (this stream has no this window).

Error:

NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Search.SearchDetailView.RefreshActions (UnityEditor.Search.SearchContext context) (at /Users/bokken/build/output/unity/unity/Modules/QuickSearch/Editor/UITK/SearchDetailView.cs:261)
UnityEditor.Search.SearchDetailView.<Refresh>b__35_0 () (at /Users/bokken/build/output/unity/unity/Modules/QuickSearch/Editor/UITK/SearchDetailView.cs:224)
UnityEngine.UIElements.VisualElement+SimpleScheduledItem.PerformTimerUpdate (UnityEngine.UIElements.TimerState state) (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/VisualElementScheduler.cs:346)
UnityEngine.UIElements.TimerEventScheduler.UpdateScheduledEvents () (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/Scheduler.cs:362)
UnityEngine.UIElements.UIElementsUtility.UnityEngine.UIElements.IUIElementsUtility.UpdateSchedulers () (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:273)
UnityEngine.UIElements.UIEventRegistration.UpdateSchedulers () (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Core/UIElementsUtility.cs:105)
UnityEditor.RetainedMode.UpdateSchedulers () (at /Users/bokken/build/output/unity/unity/ModuleOverrides/com.unity.ui/Editor/RetainedMode.cs:55)