In the function wsf_parse_payload_for_class_map(DomNode $payload, array $parameter_struct, $element_name, $class_map), neither $current_child or $parse_tree get set. It does not appear to stop whatever is happening from happening, but it does throw annoying errors.

    /* for now, we only support complex type sequences */

    //$child_nodes = $payload->childNodes;

    $current_child = $payload->firstChild;

    while($current_child != NULL && $current_child->nodeType != XML_ELEMENT_NODE)

    {

        $current_child = $current_child->nextSibling;

    }

    if($current_child == NULL)

    {

        return $parse_tree;

    }