--- RadioactivityDeferredIncidentStorage.inc.orig       2013-05-02 17:33:08.435929295 +0200
+++ RadioactivityDeferredIncidentStorage.inc    2013-05-02 17:32:05.780039479 +0200
@@ -15,7 +15,7 @@
    * add incident to the deferred storage
    * @entity_energy energy by entity id
    */
-  public function addIncident($incident) {
+  public function addIncident(RadioactivityIncident $incident) {

     db_insert('radioactivity_deferred_incidents')->fields(array('data' => serialize($incident)))->execute();
   }