Rendering Debugger Window stops rendering the window's content and throws NullReferenceException when Diffusion Profile List component is selected in the Volume section

Steps to reproduce:

1. Open the attached project
2. In the Rendering Debugger window, switch to the Volume section
3. In the Component drop-down menu, select Material -> Diffusion Profile List option
4. Observe the Rendering Debugger and the Console windows

Actual results: Rendering Debugger window stops rendering the window content and a NullReferenceException error is thrown in the Console

Expected results: Rendering Debugger window displays Diffusion Profile List data without warnings or errors

Reproducible with versions: 6000.5.0a7, 6000.5.0b1, 6000.6.0a1

Not reproducible with versions: 2022.3.74f1, 6000.0.71f1, 6000.3.11f1, 6000.4.1f1, 6000.5.0a6

Tested on (OS): Windows 11, macOS 26.3.1

Notes:

• Issue occurs regardless if the Scene or Game camera is selected
• Was not able to reproduce the issue with any other component from the drop-down list