- Patch #28871 by Malthus: added missing quotes.

includes/xmlrpc.inc

@@ -49,7 +49,7 @@ function xmlrpc_value_calculate_type(&$xmlrpc_value) {
       $xmlrpc_value->data = get_object_vars($xmlrpc_value->data);
       return 'struct';
     default:
-      return string;
+      return 'string';
   }
 }