diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index 42dc528aada..e0ba83e13c2 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -3678,7 +3678,7 @@ abstract class CommonObject
 
 		global $db;
 
-		$sql = 'SELECT '.$field_select.' FROM '.MAIN_DB_PREFIX.$table_element.' WHERE '.$field_where.' = '.$fk_object_where;
+		$sql = 'SELECT '.$field_select.' FROM '.MAIN_DB_PREFIX.$table_element.' WHERE '.$field_where.' = '.((int) $fk_object_where);
 		$resql = $db->query($sql);
 
 		$TRes = array();