diff --git a/htdocs/core/class/commonobject.class.php b/htdocs/core/class/commonobject.class.php
index cc7f5816b13..39ef25cb706 100644
--- a/htdocs/core/class/commonobject.class.php
+++ b/htdocs/core/class/commonobject.class.php
@@ -8369,7 +8369,7 @@ abstract class CommonObject
 									$isDependList = 1;
 								}
 
-								$data[(int) $obj->rowid] = $labeltoshow;
+								$data[$obj->rowid] = $labeltoshow;	// Warning: $obj->rowid is an alias and can be an int, but also a string ref.
 							}
 
 							$i++;