[@anandkumar4u Participant 13 years, 1 month ago]

OK. I figured out the problem.

The code should be:

function custom_logged_in_topics($have_posts){
    if (!is_user_logged_in()){
        $have_posts = null;
  	    echo 'Login to see replies';
    }
    return $have_posts;
}
 
add_filter('bbp_has_topics', 'custom_logged_in_topics');
add_filter('bbp_has_forums', 'custom_logged_in_topics');
add_filter('bbp_has_replies', 'custom_logged_in_topics');

Got from earlier thread. (That code was not working because of backtick instead on ‘ or “)