Index: plugins/views_data_export_plugin_style_export.inc
===================================================================
--- plugins/views_data_export_plugin_style_export.inc	(revision 5186)
+++ plugins/views_data_export_plugin_style_export.inc	(working copy)
@@ -319,7 +319,12 @@
           continue;
         }
         if (!empty($view->exposed_input[$handler->options['expose']['identifier']])) {
-          $exposed[] = check_plain($handler->options['expose']['identifier']) . '_' . check_plain($view->exposed_input[$handler->options['expose']['identifier']]);
+          $filter_data = $view->exposed_input[$handler->options['expose']['identifier']];
+          // Convert the exposed filter input to scalar data if necessary.
+          if (is_array($filter_data)) {
+            $filter_data = implode('-', $filter_data);
+          }
+          $exposed[] = check_plain($handler->options['expose']['identifier']) . '_' . check_plain($filter_data);
         }
       }
       if (!empty($exposed)) {