Bug: Now please change your nicename.

That link is broken for me. Which is part of the message saying:
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SX User Name Security
Your login and your nicename (used in URLs) are the same and this is not secure. We don’t want to force the change of this because it can lead to a 404 error. WordPress do not permit this edit easily.
You are already using SF Author Url Control. Now please change your nicename.
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It may be due to that I’m using theme my login but when I hit that link I get:

/wp-admin/profile#user_nicename which gives:

Page not found – Project Packs

Notice: Trying to get property of non-object in /home/public_html/wp-includes/post-template.php on line 29

Which is shown 40+ times or so.

https://wordpress.org/plugins/user-name-security/