protected function _addPageNrParam($url, $currentPage, $languageId = null)
    {
        if (\OxidEsales\Eshop\Core\Registry::getUtils()->seoIsActive() && ($category = $this->getActiveCategory())) {
            if ($currentPage) {
                // only if page number > 0
                $url = $category->getBaseSeoLink($languageId, $currentPage);
            }
        } else {
            $url = parent::_addPageNrParam($url, $currentPage, $languageId);
        }

        return $url;
    }