Index: Zend/Amf/Parse/Amf0/Serializer.php
===================================================================
@@ -207,10 +207,12 @@
         ) {
             $ref = array_search($object, $this->_referenceObjects, true);
             //handle object reference
+            /*
             if($ref !== false){
                 $this->writeTypeMarker($ref,Zend_Amf_Constants::AMF0_REFERENCE);
                 return true;
             }
+            */
 
             $this->_referenceObjects[] = $object;
         }