Render Pipeline Converter throws error when Converter is closed while in the process of initialization

Steps to reproduce:

1. Create a new URP project
2. Open Render Pipeline Converter window (Window > Rendering > Render Pipeline Converter)
3. Checkmark all options (Renderer and Settings Assets Setup, Material Upgrade, Animation Clip Converter and Readonly Material Converter) to initialize. 
4. Press Initialize Converters and quickly close Render Pipeline Converter window

Actual results: MissingReferenceException: The object of type 'UnityEditor.Rendering.Converter.RenderPipelineConvertersEditor' has been destroyed but you are still trying to access it.

Expected results: No Error is thrown

Reproducible with: 6000.4.0a2, 6000.3.0.b4, 6000.2.6f2, 6000.1.17f1, 6000.0.58f2, 2023.3.0b10, 2022.3.62f1
Not reproducible with:  -