add_filter( 'pre_handle_404', function($param1, $param2) {
    $post_id = url_to_postid("http://".$_SERVER['HTTP_HOST'].$_SERVER['REQUEST_URI']);
    if (!empty($post_id)) {
       $td_post_theme_settings = td_util::get_post_meta_array( $post_id, 'td_post_theme_settings' );
       if ( is_array( $td_post_theme_settings ) && array_key_exists( 'smart_list_template', $td_post_theme_settings ) ) {
            return true;
       }
    }
    return $param1;
}, 10, 2);