diff --git a/koha-tmpl/intranet-tmpl/prog/en/includes/js-biblio-format.inc b/koha-tmpl/intranet-tmpl/prog/en/includes/js-biblio-format.inc
index c06002600f..5f73dc683a 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/includes/js-biblio-format.inc
+++ b/koha-tmpl/intranet-tmpl/prog/en/includes/js-biblio-format.inc
@@ -9,7 +9,7 @@
          */
         window.$biblio_to_html = function(biblio, config) {
 
-            if (biblio === undefined) {
+            if (!biblio) {
                 return ''; // empty string for no biblio
             }