Member url's fail when nicename is empty when using compatibility mode.

[liammitchell]

Fallback to lower(user_login) when nicename is empty string?

Additionally if iThemes security suggest putting

define('BP_ENABLE_USERNAME_COMPATIBILITY_MODE', false);

in the wp-config.php if using the user_nicename must not be the same as user_id feature.

This was happening in a version prior to 6, 4.4.0 I updated to 6 to see if it would fix it but it was still present.

Additionally without the compatibility mode enabled, urls seemed to fail when nicename is different to user_login.

members/me was giving blank page content or a 404 depending on the url.
Theme used did not appear to matter.

[liammitchell]

To add some more info.

The extension Restrict Usernames Emails Characters appears to be setting the nicename to empty string when a user makes a checkout via woocommerce.
​https://wordpress.org/support/topic/buddypress-with-username-compatibility-mode/

Not 100% on this however.

​https://github.com/ithemes/iThemes-Security/issues/138

[imath]

The issue has been fixed by the plugin see: ​https://wordpress.org/support/topic/buddypress-with-username-compatibility-mode/#post-13157095