Index: includes/xmlrpcs.inc
===================================================================
--- includes/xmlrpcs.inc	(revision 532)
+++ 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) && !empty($result->is_error)) {
     xmlrpc_server_error($result);
   }
   // Encode the result
@@ -235,7 +235,7 @@
     elseif ($ok) {
       $result = xmlrpc_server_call($xmlrpc_server, $method, $params);
     }
-    if ($result->is_error) {
+    if (is_object($result) && !empty($result->is_error)) {
       $return[] = array(
         'faultCode' => $result->code,
         'faultString' => $result->message