--- ./plugins/views_data_export_plugin_style_export.inc	2011-05-01 18:34:07.000000000 +0300
+++ ./plugins/views_data_export_plugin_style_export.inc	2011-05-01 18:34:07.000000000 +0300
@@ -323,6 +323,9 @@ class views_data_export_plugin_style_exp
       if (!empty($exposed)) {
         $tokens['%exposed'] = implode('-', $exposed);
       }
+      else {
+        $tokens['%exposed'] = 'default' ;
+      }
 
       // Timestamp token.
       $time = time();