When using the hidden content feature, if a star has no videos that are visible due to all of them being hidden by a hidden tag, that profile can't be read at all; attempting to go to the profile page kicks you back out to the home screen.
Example: Lexi Mansfield has two scenes, both of which are solo. If I hide the tag "Solo Models", not only are all of her videos hidden, which is expected, but attempting to go to her profile page is impossible; instead of being able to read the profile page with an "All Videos Hidden" message for her content, trying to go to the profile instead redirects me to the front page of the site.
EDIT: After some testing, it seems if all of a star's videos are hidden, whether through individual video hiding, category hiding, or studio hiding, then their profile is unreadable. This is different than when you hide the star themselves; in that case, the profile is still readable if you do a search for the star. I would argue that it's better for a star's profile to always be reachable by search, even if all their videos are hidden for some reason.