diff --git a/classes/Product.php b/classes/Product.php
index 2079d5d22..28990bb7d 100644
--- a/classes/Product.php
+++ b/classes/Product.php
@@ -2841,6 +2841,7 @@ class ProductCore extends ObjectModel
 				WHERE pa.`id_product` = '.(int)$this->id.'
 					AND al.`id_lang` = '.(int)$id_lang.'
 					AND agl.`id_lang` = '.(int)$id_lang.'
+				GROUP BY id_attribute_group, id_product_attribute
 				ORDER BY ag.`position` ASC, a.`position` ASC';
 		return Db::getInstance()->executeS($sql);
 	}