Steps to repro:
1. Create the new HDRP project and scene;
2. Add empty gameobject;
3. In the Inspector click Add Component>Light;
4. In the context menu select Window>Rendering>Light Explorer;
5. In the context menu select File>New Scene and double-click on Empty;
6. Press Don't Save in the popup window.

Actual result:
Exception in NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Rendering.HighDefinition.HDLightExplorerExtension+<>c.<GetHDLightColumns>b__12_3 (UnityEngine.Rect r, UnityEditor.SerializedProperty prop, UnityEditor.SerializedProperty[] dep) (at Library/PackageCache/com.unity.render-pipelines.high-definition@13.1.2/Editor/Lighting/HDLightExplorerExtension.cs:244) is shown.
See attached video.
Regression introduced in-between Versions 2021.1 and 2022.2.

Expected result:
No errors are shown after creating new scene.

Notes:
- Reproducible in Version 2022.2.0a1, 2020.3.25f1;
- Not reproducible in Version 2020.3.25f1;
- Reproducible on Windows.