Custom error page with empty error and error_description query params

Hi,

Some of our users are facing issues when they are logging out.
Auth0 is redirecting to our custom error page however, both error and error_description are empty with only tracking being passed.

https://<>/home/Auth0Error?client_id=&connection=&lang=en-US%2Cen%3Bq%3D0.9&error=&error_description=&tracking=<>

Do you know how or why these properties are not getting populated?
I can provide tracking ids if needed.

Many thanks,
Lee