diff --git a/src/Web/wwwroot/app/settings/settingsTwoFactorController.js b/src/Web/wwwroot/app/settings/settingsTwoFactorController.js
index 3c4d2345cb..44d34564f0 100644
--- a/src/Web/wwwroot/app/settings/settingsTwoFactorController.js
+++ b/src/Web/wwwroot/app/settings/settingsTwoFactorController.js
@@ -33,6 +33,10 @@
         };
 
         function formatString(s) {
+            if (!s) {
+                return null;
+            }
+
             return s.replace(/(.{4})/g, '$1 ').trim().toUpperCase();
         }