diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index e6198c8bb6e..32796db2147 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -701,7 +701,7 @@ abstract class CommonObject
 	public $user_creation;
 
 	/**
-	 * @var int			User id author/creation
+	 * @var int|null	User id author/creation
 	 */
 	public $user_creation_id;