diff --git a/ajax_facets.pages.inc b/ajax_facets.pages.inc
index 4c38e34..b059b1c 100755
--- a/ajax_facets.pages.inc
+++ b/ajax_facets.pages.inc
@@ -20,7 +20,7 @@ function ajax_facets_refresh_facets_content() {
   $searcher = 'search_api@' . $_GET['index_id'];
   $adapter = facetapi_adapter_load($searcher);
   $blocks = ajax_facets_process_facet_blocks($searcher);
-  $facet_query = !empty($_GET['f']) ? $_GET['f'] : '';
+  $facet_query = !empty($_GET['f']) ? $_GET['f'] : array();
 
   $result = array(
     'applyUrl' => ajax_facets_facet_build_apply_path($adapter),