diff --git a/src/App/Pages/CaptchaProtectedViewModel.cs b/src/App/Pages/CaptchaProtectedViewModel.cs
index 22a4349a1..64693c5eb 100644
--- a/src/App/Pages/CaptchaProtectedViewModel.cs
+++ b/src/App/Pages/CaptchaProtectedViewModel.cs
@@ -27,7 +27,12 @@ namespace Bit.App.Pages
                 captchaRequiredText = AppResources.CaptchaRequired,
             });
 
-            var url = environmentService.GetWebVaultUrl() + "/captcha-mobile-connector.html?" + "data=" + data +
+            var url = environmentService.GetWebVaultUrl();
+            if (url == null)
+            {
+                url = "https://vault.bitwarden.com";
+            }
+            url += "/captcha-mobile-connector.html?" + "data=" + data +
                 "&parent=" + Uri.EscapeDataString(callbackUri) + "&v=1";
 
             WebAuthenticatorResult authResult = null;