Comment 2 for bug 1958297

I can also get this error:
[TypeError]: Argument 1 passed to Submissions\Tools\SubmissionTools::createPortfolioTitleHtml() must be of the type string, null given, called in htdocs/module/submissions/src/Tools/SubmissionTools.php on line 344 at htdocs/module/submissions/src/Tools/SubmissionTools.php:288

To replicate:

1) log in as admin user and create a group that allows submissions
2) invite a person to the group
3) log in as that person and accept invitation
4) create a collection with one page and submit that collection to the group
5) log in as admin user and go to the Share -> Submissions page - things should look correct
6) delete the person
7) go to the Share -> Submissions page - things should be now broken