diff --git a/include/class.organization.php b/include/class.organization.php
index 0c08a4f30c08281e8b473747944b3c81046a1b0d..e870667b1f10e2132b9bdc51a2fa7c18e65f02aa 100644
--- a/include/class.organization.php
+++ b/include/class.organization.php
@@ -257,7 +257,7 @@ implements TemplateVariable {
         }
     }
 
-    function addForm($form, $sort=1, $data) {
+    function addForm($form, $sort=1, $data=null) {
         $entry = $form->instanciate($sort, $data);
         $entry->set('object_type', 'O');
         $entry->set('object_id', $this->getId());