diff -u b/core/misc/collapse.js b/core/misc/collapse.js
--- b/core/misc/collapse.js
+++ b/core/misc/collapse.js
@@ -150,7 +150,7 @@
    */
   Drupal.behaviors.revealChildrenOfGroupedElements = {
     attach: function (context) {
-      $(context).once('revealChildrenOfGroupedElements').on('click', $('a[href^="#"]', context), function(event) {
+      $(context).once('revealChildrenOfGroupedElements').on('click', 'a[href^="#"]', function(event) {
         var $item = $(event.target.hash);
         if ($item.length) {