diff --git a/classes/Attribute.php b/classes/Attribute.php
index 93391bc6c..3f694958d 100644
--- a/classes/Attribute.php
+++ b/classes/Attribute.php
@@ -139,7 +139,7 @@ class AttributeCore extends ObjectModel
 				ON (a.`id_attribute` = al.`id_attribute` AND al.`id_lang` = '.(int)$id_lang.')
 			'.Shop::addSqlAssociation('attribute_group', 'ag').'
 			'.Shop::addSqlAssociation('attribute', 'a').'
-			'.($not_null ? 'WHERE a.`id_attribute` IS NOT NULL AND al.`name` IS NOT NULL' : '').'
+			'.($not_null ? 'WHERE a.`id_attribute` IS NOT NULL AND al.`name` IS NOT NULL AND agl.`id_attribute_group` IS NOT NULL' : '').'
 			ORDER BY agl.`name` ASC, a.`position` ASC
 		');
 	}
@@ -343,4 +343,4 @@ class AttributeCore extends ObjectModel
 
 		return (is_numeric($position)) ? $position : -1;
 	}
-}
\ No newline at end of file
+}