diff --git a/koha-tmpl/intranet-tmpl/prog/en/modules/authorities/detail.tt b/koha-tmpl/intranet-tmpl/prog/en/modules/authorities/detail.tt
index ed8462716d..74ab0c56ee 100644
--- a/koha-tmpl/intranet-tmpl/prog/en/modules/authorities/detail.tt
+++ b/koha-tmpl/intranet-tmpl/prog/en/modules/authorities/detail.tt
@@ -136,7 +136,7 @@
     <script>
         $(document).ready(function() {
             if( $("#authoritiestabs .tab-pane.active").length < 1 ){
-                let tab_object;
+                let tab_object = [];
 
                 [% SET DefaultAuthorityTab = Koha.Preference('DefaultAuthorityTab') %]
                 [% IF DefaultAuthorityTab %]