NullReferenceException in the Console, when clicking inside the RG Viewer window during the Playmode

Steps to reproduce:

1. Download attached project and open in Unity.
2. Open the RG Viewer window >> Window >> Analysis >> Render Graph Viewer.
3. Enter the Playmode.
4. Click anywhere inside the RG Viewer window.

Observe: NullReferenceException messages in the Console.

Actual results: NullReferenceException in the Console window.

Expected results: No errors in the Console.

Reproducible with versions: 6000.6.0b3, 6000.7.0a4

Not reproducible with versions: 6000.5.4f1

Tested on (OS): MacBook Pro (16-inch, 2021), CPU: Apple M1 Max, Memory: 64 GB, macOS Tahoe: 26.1