Глючек в в функции iShop при выборе след./предыдущего товара

 
    public function getItemNav($item_id, $cat_id) {
 
        $ordering = $this->inDB->get_field('cms_shop_items_cats', "item_id={$item_id} AND category_id={$cat_id}", 'ordering');
 
 
        $nav = array();
 
        $sql = "SELECT i.id as id, i.seolink as seolink, ic.ordering as ordering, i.title as title
                FROM cms_shop_items i, cms_shop_items_cats ic
                WHERE ic.item_id = i.id
                  AND ic.category_id = {$cat_id}
                  AND (ic.ordering < {$ordering}) AND i.published=1 ORDER BY ordering DESC LIMIT 1";
 
        $result = $this->inDB->query($sql);
        $nav['prev'] = $this->inDB->fetch_assoc($result);
 
        $sql = "SELECT i.id as id, i.seolink as seolink, ic.ordering as ordering, i.title as title
                FROM cms_shop_items i, cms_shop_items_cats ic
                WHERE ic.item_id = i.id
                  AND ic.category_id = {$cat_id}
                  AND (ic.ordering > {$ordering}) AND i.published=1 ORDER BY ordering LIMIT 1";
 
        $result = $this->inDB->query($sql);
        $nav['next'] = $this->inDB->fetch_assoc($result);
 
 
        return $nav;
 
    }