diff --git a/contrib/search_api_views/includes/handler_filter_taxonomy_term.inc b/contrib/search_api_views/includes/handler_filter_taxonomy_term.inc
index 732ab99b..51982b0e 100644
--- a/contrib/search_api_views/includes/handler_filter_taxonomy_term.inc
+++ b/contrib/search_api_views/includes/handler_filter_taxonomy_term.inc
@@ -323,7 +323,7 @@ public function expose_form(&$form, &$form_state) {
   protected function ids_to_strings(array $ids) {
     $ids = array_filter($ids);
     if (!$ids) {
-      return array();
+      return '';
     }
     return implode(', ', db_select('taxonomy_term_data', 'td')
       ->fields('td', array('name'))