1) Open hdrp project that does not use APV (disabled)
2) Go to Window -> Rendering -> Probe Volume Settings (Experimental)
3) Dock the window somewhere
4) Select anything in the scene
5) Hit Undo

An error will pop:
NullReferenceException: Object reference not set to an instance of an object
UnityEngine.Experimental.Rendering.ProbeVolumeBakingWindow.InitializeBakingSetList () (at D:/Git/Graphics/com.unity.render-pipelines.core/Editor/Lighting/ProbeVolume/ProbeVolumeBakingWindow.cs:106)
UnityEngine.Experimental.Rendering.ProbeVolumeBakingWindow.RefreshAfterUndo () (at D:/Git/Graphics/com.unity.render-pipelines.core/Editor/Lighting/ProbeVolume/ProbeVolumeBakingWindow.cs:176)
UnityEditor.Undo.Internal_CallUndoRedoPerformed () (at <459c57c4d2774924b076fc0df07c5268>:0)
UnityEditor.EditorApplication:Internal_CallGlobalEventHandler()