private function makeWishlistPage() {
        global $wpdb;

        $datetime = get_date_from_gmt(gmdate('Y-m-d H:i:s', time()));
        $datetime_gmt = gmdate('Y-m-d H:i:s', time());

        $query = $wpdb->prepare("SELECT ID FROM {$wpdb->posts} WHERE post_name = %s", WCEXWL_PAGE_SLUG);
        $pageid = $wpdb->get_var($query);

        if ($pageid === null) {
            $query = $wpdb->prepare(
                "INSERT INTO $wpdb->posts
                (post_author, post_date, post_date_gmt, post_content, post_title, post_excerpt, post_status,
                comment_status, ping_status, post_password, post_name, to_ping, pinged, post_modified,
                post_modified_gmt, post_content_filtered, post_parent, guid, menu_order, post_type,
                post_mime_type, comment_count)
                VALUES (%d, %s, %s, %s, %s, %s, %s,
                %s, %s, %s, %s, %s, %s, %s, %s,
                %s, %d, %s, %d, %s, %s, %d)",
                1,
                $datetime,
                $datetime_gmt,
                '',
                __('Wishlist', 'wcexwl'),
                '',
                'publish',
                'closed',
                'closed',
                '',
                WCEXWL_PAGE_SLUG,
                '',
                '',
                $datetime,
                $datetime_gmt,
                '',
                0,
                '',
                0,
                'page',
                '',
                0
            );
            $wpdb->query($query);
            $pageid = $wpdb->insert_id;
            if ($pageid !== null) {
                update_post_meta($pageid, '_wp_page_template', 'wishlist.php');
            }
        }
        update_option('wcex_wishlist_post_id', $pageid);
    }