diff --git a/classes/Product.php b/classes/Product.php
index 188ce4a05..19e5917af 100644
--- a/classes/Product.php
+++ b/classes/Product.php
@@ -3055,18 +3055,18 @@ class ProductCore extends ObjectModel
 		if (!Combination::isFeatureActive())
 			return array();
 		$sql = 'SELECT ag.`id_attribute_group`, ag.`is_color_group`, agl.`name` AS group_name, agl.`public_name` AS public_group_name,
-					a.`id_attribute`, al.`name` AS attribute_name, a.`color` AS attribute_color, pa.`id_product_attribute`,
-					IFNULL(stock.quantity, 0) as quantity, product_attribute_shop.`price`, product_attribute_shop.`ecotax`, pa.`weight`,
+					a.`id_attribute`, al.`name` AS attribute_name, a.`color` AS attribute_color, product_attribute_shop.`id_product_attribute`,
+					IFNULL(stock.quantity, 0) as quantity, product_attribute_shop.`price`, product_attribute_shop.`ecotax`, product_attribute_shop.`weight`,
 					product_attribute_shop.`default_on`, pa.`reference`, product_attribute_shop.`unit_price_impact`,
-					pa.`minimal_quantity`, pa.`available_date`, ag.`group_type`
+					product_attribute_shop.`minimal_quantity`, product_attribute_shop.`available_date`, ag.`group_type`
 				FROM `'._DB_PREFIX_.'product_attribute` pa
 				'.Shop::addSqlAssociation('product_attribute', 'pa').'
 				'.Product::sqlStock('pa', 'pa').'
-				LEFT JOIN `'._DB_PREFIX_.'product_attribute_combination` pac ON pac.`id_product_attribute` = pa.`id_product_attribute`
-				LEFT JOIN `'._DB_PREFIX_.'attribute` a ON a.`id_attribute` = pac.`id_attribute`
-				LEFT JOIN `'._DB_PREFIX_.'attribute_group` ag ON ag.`id_attribute_group` = a.`id_attribute_group`
-				LEFT JOIN `'._DB_PREFIX_.'attribute_lang` al ON a.`id_attribute` = al.`id_attribute`
-				LEFT JOIN `'._DB_PREFIX_.'attribute_group_lang` agl ON ag.`id_attribute_group` = agl.`id_attribute_group`
+				LEFT JOIN `'._DB_PREFIX_.'product_attribute_combination` pac ON (pac.`id_product_attribute` = pa.`id_product_attribute`)
+				LEFT JOIN `'._DB_PREFIX_.'attribute` a ON (a.`id_attribute` = pac.`id_attribute`)
+				LEFT JOIN `'._DB_PREFIX_.'attribute_group` ag ON (ag.`id_attribute_group` = a.`id_attribute_group`)
+				LEFT JOIN `'._DB_PREFIX_.'attribute_lang` al ON (a.`id_attribute` = al.`id_attribute`)
+				LEFT JOIN `'._DB_PREFIX_.'attribute_group_lang` agl ON (ag.`id_attribute_group` = agl.`id_attribute_group`)
 				'.Shop::addSqlAssociation('attribute', 'a').'
 				WHERE pa.`id_product` = '.(int)$this->id.'
 					AND al.`id_lang` = '.(int)$id_lang.'