TypeError: Cannot read properties of null (reading 'default')

[albertoleoncio]

Describe the feature or bug
When we navigate to the route https://capx.toolforge.org/tag/wikimedia_project/1 , we receive the application error: client-side exception has occurred (see the browser console for more information). and if we navigate to console, we see the error: TypeError: Cannot read properties of null (reading 'user')

If it is a bug, describe the steps to reproduce the behavior:

1. Go to 'https://capx.toolforge.org/tag/wikimedia_project/1'
2. See error
3. Open console and see the TypeError.

Expected behavior
The route must load correctly

Screenshots

Additional context
Add any other context or screenshots about the feature request here.