Render Graph Viewer window breaks and throws NullReferenceException after entering Play Mode when data update is paused

Steps to reproduce:

1. Open the attached project
2. Open the Render Graph Viewer window (Window -> Analysis -> RenderGraph Viewer)
3. Set Refresh mode to Pause
4. Enter Play mode
5. Observe RenderGraph Viewer and Console window

Actual results: RenderGraph Viewer window breaks, with only parts of the window being rendered. A NullReferenceException is thrown in the console

Expected results: Entering Play mode does not throw errors or negatively affect the RenderGraph Viewer window

Reproducible with versions: 6000.3.0a1, 6000.3.0f1, 6000.4.0a5, 6000.5.0a2

Not reproducible with versions: 6000.0.63f1, 6000.2.14f1

Tested on (OS): macOS 26.1, Ubuntu 24.04