MemberPress: Hide Protected Posts on Archive Page

function mepr_exclude_protected_posts_from_archive( $query ) {

  if( !$query->is_admin && $query->is_archive() && $query->is_main_query() ) {

    $posts_to_exclude = array();

    $posts = get_posts( array( 'numberposts' => -1 ) );

    foreach( $posts as $post ) {

      if( MeprRule::is_locked( $post ) ) {

        $posts_to_exclude[] = $post->ID;

      }

    }

    if( !empty( $posts_to_exclude ) ) {

      $query->set( 'post__not_in', $posts_to_exclude );

    }

  }

}

add_action( 'pre_get_posts', 'mepr_exclude_protected_posts_from_archive' );