I was creating an account at https://admin.fedoraproject.org/accounts/user/new . For the security question I had a question with an apostrophe in it, like "what is Buddy's favorite color". I hit Submit and got a 500 error. I went Back, took out the apostrophe, and hit Submit, and it worked.
This is a bug/issue in the Fedora Account System (fas).
Would you be willing to file this over at:
https://github.com/fedora-infra/fas/issues
That would be great...