Index: includes/xmlrpcs.inc
===================================================================
--- includes/xmlrpcs.inc	(revision 467)
+++ includes/xmlrpcs.inc	(working copy)
@@ -75,7 +75,7 @@
   xmlrpc_server_set($xmlrpc_server);
   $result = xmlrpc_server_call($xmlrpc_server, $xmlrpc_server->message->methodname, $xmlrpc_server->message->params);

-  if ($result->is_error) {
+  if (is_object($result) && $result->is_error) {
     xmlrpc_server_error($result);
   }
   // Encode the result