NullReferenceException errors are thrown on exiting from the Play mode when Look Dev window is opened.

Steps to repro:
1. Create a new HDRP project.
2. Windows > Render Pipeline > Look Dev > Dock the Window.
3. Environment > Library > Click on New button.
4. Enter the Play mode & Exit the Play mode.
5. Undock the window and Repeat Steps 4.

Actual Result:
NullReferenceException errors are thrown in the console.

Expected Result:
No error in the console.

Reproducible in:
2021.1.0a9, 2021.1.0a8, 2020.2.0f1 with Package version 10.2.1.

Working Fine in:
2021.1.0a7, 2020.2.0b14 with Package version 10.2.1, 10.2.0.

Note: Unable to test on Mac due to this issue https://fogbugz.unity3d.com/f/cases/1294756/

Environment:
Occurring only on Windows.

Stack trace:
NullReferenceException: Object reference not set to an instance of an object
UnityEditor.Rendering.LookDev.Stage.OnBeginRendering (UnityEngine.Rendering.LookDev.IDataProvider dataProvider) (at Library/PackageCache/com.unity.render-pipelines.core@10.2.1/Editor/LookDev/Stage.cs:247)
UnityEditor.Rendering.LookDev.Renderer.BeginRendering (UnityEditor.Rendering.LookDev.RenderingData data, UnityEngine.Rendering.LookDev.IDataProvider dataProvider) (at Library/PackageCache/com.unity.render-pipelines.core@10.2.1/Editor/LookDev/LookDevRenderer.cs:55)
UnityEditor.Rendering.LookDev.Compositer.AcquireDataForView (UnityEditor.Rendering.LookDev.ViewIndex index, UnityEngine.Rect viewport) (at Library/PackageCache/com.unity.render-pipelines.core@10.2.1/Editor/LookDev/Compositor.cs:243)
UnityEditor.Rendering.LookDev.Compositer.RenderSingleAndOutput (UnityEditor.Rendering.LookDev.ViewIndex index) (at Library/PackageCache/com.unity.render-pipelines.core@10.2.1/Editor/LookDev/Compositor.cs:265)
UnityEditor.Rendering.LookDev.Compositer.Render () (at Library/PackageCache/com.unity.render-pipelines.core@10.2.1/Editor/LookDev/Compositor.cs:206)
UnityEditor.Rendering.LookDev.DisplayWindow.OnGUI () (at Library/PackageCache/com.unity.render-pipelines.core@10.2.1/Editor/LookDev/DisplayWindow.cs:678)
UnityEditor.HostView.InvokeOnGUI (UnityEngine.Rect onGUIPosition, UnityEngine.Rect viewRect) (at <a19e86c7bf354115a4c6a5953c0575cb>:0)
UnityEditor.DockArea.DrawView (UnityEngine.Rect viewRect, UnityEngine.Rect dockAreaRect) (at <a19e86c7bf354115a4c6a5953c0575cb>:0)
UnityEditor.DockArea.OldOnGUI () (at <a19e86c7bf354115a4c6a5953c0575cb>:0)
UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize, System.Action onGUIHandler, System.Boolean canAffectFocus) (at <b82edc26c1654793bdaefb66b6a2a38a>:0)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr, Boolean&)