diff --git a/js/src/utils/auth.ts b/js/src/utils/auth.ts
index 534456782..e34db00c6 100644
--- a/js/src/utils/auth.ts
+++ b/js/src/utils/auth.ts
@@ -140,4 +140,5 @@ export const SELECTED_PROVIDERS: { [key: string]: string } = {
   google: "Google",
   keycloak: "Keycloak",
   ldap: "LDAP",
+  cas: "CAS",
 };
diff --git a/js/src/views/User/Login.vue b/js/src/views/User/Login.vue
index 953b75574..08d0b6204 100644
--- a/js/src/views/User/Login.vue
+++ b/js/src/views/User/Login.vue
@@ -18,7 +18,9 @@
             $t(
               "Error while login with {provider}. Retry or login another way.",
               {
-                provider: $route.query.provider,
+                provider:
+                  SELECTED_PROVIDERS[$route.query.provider] ||
+                  "unknown provider",
               }
             )
           }}</b-message
@@ -31,7 +33,9 @@
             $t(
               "Error while login with {provider}. This login provider doesn't exist.",
               {
-                provider: $route.query.provider,
+                provider:
+                  SELECTED_PROVIDERS[$route.query.provider] ||
+                  "unknown provider",
               }
             )
           }}</b-message
@@ -136,6 +140,7 @@ import {
   initializeCurrentActor,
   NoIdentitiesException,
   saveUserData,
+  SELECTED_PROVIDERS,
 } from "../../utils/auth";
 import { ILogin } from "../../types/login.model";
 import {
@@ -198,6 +203,8 @@ export default class Login extends Vue {
     email: validateEmailField,
   };
 
+  SELECTED_PROVIDERS = SELECTED_PROVIDERS;
+
   submitted = false;
 
   mounted(): void {
diff --git a/lib/web/controllers/auth_controller.ex b/lib/web/controllers/auth_controller.ex
index f1ba410e8..014a112b7 100644
--- a/lib/web/controllers/auth_controller.ex
+++ b/lib/web/controllers/auth_controller.ex
@@ -4,6 +4,7 @@ defmodule Mobilizon.Web.AuthController do
   alias Mobilizon.Service.Auth.Authenticator
   alias Mobilizon.Users
   alias Mobilizon.Users.User
+  import Mobilizon.Service.Guards, only: [is_valid_string: 1]
   require Logger
   plug(:put_layout, false)
 
@@ -106,7 +107,11 @@ defmodule Mobilizon.Web.AuthController do
   defp email_from_ueberauth(%Ueberauth.Auth{
          extra: %Ueberauth.Auth.Extra{raw_info: %{user: %{"email" => email}}}
        })
-       when not is_nil(email) and email != "",
+       when is_valid_string(email),
+       do: email
+
+  defp email_from_ueberauth(%Ueberauth.Auth{info: %Ueberauth.Auth.Info{email: email}})
+       when is_valid_string(email),
        do: email
 
   defp email_from_ueberauth(_), do: nil