Sadly, as soon as I open the site in a private window with access to Notifications denied, a full page error screen about "Odoo Client Error" appears asking you

Sadly, as soon as I open the site in a private window with access to Notifications denied, a full page error screen about "Odoo Client Error" appears asking you to report... something.... to someone...? Not a good look at all. Screenshot: https://postimg.cc/WFDzQndC https://postimg.cc/WFDzQndC