Problem

When someone hovers the mouse on a customer's name, Jira shows the profile card with a link to their profile (instance.atlassian.net/secure/ViewProfile.jspa?accountId=..........), but the customer doesn't have one.

Along with it if you find the customer and clicks on their name, an error is thrown.

Internal users without any application access (customers) also don't have a profile and the same page is thrown.

Suggested resolution

Remove the link to the customer's profile.