diff -u b/core/misc/form.es6.js b/core/misc/form.es6.js
--- b/core/misc/form.es6.js
+++ b/core/misc/form.es6.js
@@ -264,7 +264,7 @@
    *
    * @fires event:formFragmentLinkClickOrHashChange
    */
-  function handleFragmentLinkClickOrHashChange(e) {
+  const handleFragmentLinkClickOrHashChange = (e) => {
     let url;
     if (e.type === 'click') {
       url = e.currentTarget.location ? e.currentTarget.location : e.currentTarget;
diff -u b/core/misc/form.js b/core/misc/form.js
--- b/core/misc/form.js
+++ b/core/misc/form.js
@@ -125,7 +125,7 @@
     }
   };
 
-  function handleFragmentLinkClickOrHashChange(e) {
+  var handleFragmentLinkClickOrHashChange = function handleFragmentLinkClickOrHashChange(e) {
     var url = void 0;
     if (e.type === 'click') {
       url = e.currentTarget.location ? e.currentTarget.location : e.currentTarget;