We have a new user with the Customer Support badge, @anon95105010. He doesn’t have the First Edition badge but I still can’t view his badges page. So that means any manually granted badge causes this problem.
I looked at Discourse Meta and found out that there is probably an easy fix: As far as I understood from this topic we just have to put the manual badges in a badge group. Like “Getting Started”, “Community”, “Posting” “Trust Level” & “Other”.