When Geometry and Weights are applied to the sprite in Skinning editor and sprite subcomponent is selected in the project window then editor throws NullReffrenceException

Steps to Reproduce:
1. Create a New Project with 2D Template
2. Import .PSB file in the project.
3. Window > 2D > Sprite editor.
4. Project > Fei_Cel_group.PSB .
5. Sprite Editor > Skinning Editor > Create Bone > Auto Geometry > Genrate for all visible > Apply
6. Project > PSB file > Select some child sprite

Actual Result:
Null reference on selecting sprite sub-component when Geometry and Weight are applied on it in Skking Editor

Expected Result:
Sprite subcomponents are selected without errors after applying geometry and weights

Reproducible on:
2020.2.0a13, 2020.2.0a9, 2020.1.0b11, 2020.1.0b8, 2019.3.15f1, 2019.3.14f1

Working fine on:
2020.2.0a8, 2020.1.0b7, 2019.3.13f1

Package Found version:
4.2.4, 4.2.2, 3.2.2

Package Found version:
4.2.1, 3.2.1

Stack trace:
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.U2D.Animation.SpriteSkinEditor.OnInspectorGUI () (at library/packagecache/com.unity.2d.animation@4.2.2/editor/spriteskin/spriteskineditor.cs:129)
UnityEditor.UIElements.InspectorElement+<>c__DisplayClass58_0.<CreateIMGUIInspectorFromEditor>b__0 () (at /Users/builduser/buildslave/unity/build/Editor/Mono/Inspector/InspectorElement.cs:535)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&) (at /Users/builduser/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:189)

Environment:
Windows 10 and macOS 10.15