Sanırım Sorun

<file name="admin/model/catalog/product.php">
<operation>

<search position="replace"><![CDATA[if ($data['keyword']) {]]></search>
<add><![CDATA[
if (!$data['keyword']) {
$keyword = $this->document->title2uri($data['product_description'][1]['name'],$this->db);
$this->db->query("INSERT INTO " . DB_PREFIX . "url_alias SET query = 'product_id=" . (int)$product_id . "', keyword = '" . $this->db->escape($keyword) . "-" . int)$product_id . "'");
}
else{
]]></add>




</operation>
</file>

yerine

<file name="admin/model/catalog/product.php">
<operation>

<search position="replace"><![CDATA[if ($data['keyword']) {]]></search>
<add><![CDATA[
if (!$data['keyword']) {
$keyword = $this->document->title2uri($data['product_description'][1]['name'],$this->db);
$this->db->query("INSERT INTO " . DB_PREFIX . "url_alias SET query = 'product_id=" . (int)$product_id . "', keyword = '" . $this->db->escape($keyword) . "-" . (int)$product_id . "'");
}
else{
]]></add>




</operation>
</file>

olması

(int)$product_id int)$product_id olarak yazmışsınız.