I wasn’t into debugging, so now i learnt how to do that and found out, that an old snippet which i pasted to the functions.php caused the issue:
[16-Jan-2021 17:01:47 UTC] PHP Fatal error: Uncaught Error: Call to undefined function wpum_get_profile_url() in /www/htdocs/w012a5XX/fk12.org/master/wp-content/themes/astra-child/functions.php:144
add_filter( ‘author_link’, ‘wpum_author_link’, 10, 2 );
function wpum_author_link( $link, $user_id ) {
$user = new \WP_User( $user_id );
return wpum_get_profile_url( $user );
}
Thank you for your response anyway.
Also Great Plugin (if i would have a usage for it)
Kind regards