diff --git a/assets/js/session/index.js b/assets/js/session/index.js
index d9d4b9536..38072865a 100644
--- a/assets/js/session/index.js
+++ b/assets/js/session/index.js
@@ -461,7 +461,8 @@ function editableElementClicked(event, element) {
  * Focuses a focusable element if the user "tab"s anywhere into it.
  */
 function handleDocumentFocus(hook, event) {
-  const focusableEl = event.target.closest(`[data-focusable-id]`);
+  const focusableEl =
+    event.target.closest && event.target.closest(`[data-focusable-id]`);
 
   if (focusableEl) {
     const focusableId = focusableEl.dataset.focusableId;