diff --git a/ietf/static/js/session_details_form.js b/ietf/static/js/session_details_form.js
index 84dbc51736..29b481999f 100644
--- a/ietf/static/js/session_details_form.js
+++ b/ietf/static/js/session_details_form.js
@@ -55,9 +55,19 @@
 
     function update_name_field_visibility(name_elts, purpose) {
         if (!purpose || purpose === 'regular') {
-            name_elts.forEach(e => e.closest('.form-group').classList.add('hidden'));
+            name_elts.forEach(e => {
+                const formGroup = e.closest('.form-group');
+                if (formGroup) {
+                    formGroup.classList.add('hidden');
+                }
+            });
         } else {
-            name_elts.forEach(e => e.closest('.form-group').classList.remove('hidden'));
+            name_elts.forEach(e => {
+                const formGroup = e.closest('.form-group');
+                if (formGroup) {
+                    formGroup.classList.remove('hidden');
+                }
+            });
         }
     }