diff --git a/react/features/notifications/functions.js b/react/features/notifications/functions.js
index f2664d7cc..1cbad693a 100644
--- a/react/features/notifications/functions.js
+++ b/react/features/notifications/functions.js
@@ -24,5 +24,5 @@ export function areThereNotifications(stateful: Object | Function) {
  * @returns {boolean}
  */
 export function joinLeaveNotificationsDisabled() {
-    return Boolean(interfaceConfig?.DISABLE_JOIN_LEAVE_NOTIFICATIONS);
+    return Boolean(typeof interfaceConfig !== 'undefined' && interfaceConfig?.DISABLE_JOIN_LEAVE_NOTIFICATIONS);
 }
diff --git a/react/features/presence-status/functions.js b/react/features/presence-status/functions.js
index c22e4cc62..442c44524 100644
--- a/react/features/presence-status/functions.js
+++ b/react/features/presence-status/functions.js
@@ -8,5 +8,5 @@ declare var interfaceConfig: Object;
  * @returns {boolean}
  */
 export function presenceStatusDisabled() {
-    return Boolean(interfaceConfig?.DISABLE_PRESENCE_STATUS);
+    return Boolean(typeof interfaceConfig !== 'undefined' && interfaceConfig?.DISABLE_PRESENCE_STATUS);
 }