Index: includes/xmlrpcs.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/xmlrpcs.inc,v
retrieving revision 1.24.2.2
diff -u -r1.24.2.2 xmlrpcs.inc
--- includes/xmlrpcs.inc	6 Nov 2009 08:07:38 -0000	1.24.2.2
+++ includes/xmlrpcs.inc	1 Dec 2009 03:21:49 -0000
@@ -64,6 +64,9 @@
   if ($xmlrpc_server->message->messagetype != 'methodCall') {
     xmlrpc_server_error(-32600, t('Server error. Invalid XML-RPC. Request must be a methodCall.'));
   }
+  if (!isset($xmlrpc_server->message->params)) {
+    $xmlrpc_server->message->params = array();
+  }
   xmlrpc_server_set($xmlrpc_server);
   $result = xmlrpc_server_call($xmlrpc_server, $xmlrpc_server->message->methodname, $xmlrpc_server->message->params);