diff --git a/src/Controller/UserController.php b/src/Controller/UserController.php
index eb2e892..96b52ec 100644
--- a/src/Controller/UserController.php
+++ b/src/Controller/UserController.php
@@ -4,6 +4,7 @@ namespace App\Controller;
 
 use App\Form\{CreateUserRequestType};
 use App\FormRequest\CreateUserRequest;
+use App\Repository\InviteRepository;
 use App\User\Exception\InvalidInviteException;
 use App\User\{InviteManager, UserManager};
 use Doctrine\ORM\EntityManagerInterface;
@@ -19,21 +20,27 @@ class UserController extends Controller
         Request $request,
         EntityManagerInterface $em,
         UserManager $userManager,
-        InviteManager $inviteManager
+        InviteManager $inviteManager,
+        InviteRepository $inviteRepo
     ): Response {
-        $createUserRequest = new CreateUserRequest();
-        $createUserRequest->inviteCode = $inviteCode;
+        $createUserRequest = new CreateUserRequest($inviteCode);
         $form = $this->createRegisterForm($createUserRequest, $inviteCode);
 
+        $inviteInvalid = false;
+
+        if (null === $invite = $inviteRepo->findOneBy(['code' => $inviteCode, 'usedBy' => null])) {
+            $inviteInvalid = true;
+        }
+
         $form->handleRequest($request);
 
         if ($form->isSubmitted() && $form->isValid()) {
             try {
-                $user = $userManager->createUserByInviteCode(
+                $user = $userManager->createUserByInvite(
                     $createUserRequest->username,
                     $createUserRequest->password,
                     $createUserRequest->email,
-                    $createUserRequest->inviteCode
+                    $invite
                 );
 
                 $inviteManager->createInvitesForUser($user);
@@ -49,7 +56,10 @@ class UserController extends Controller
             return $this->redirectToRoute('index');
         }
 
-        return $this->render('User/register.html.twig', ['form' => $form->createView()]);
+        return $this->render('User/register.html.twig', [
+            'form' => $form->createView(),
+            'inviteInvalid' => $inviteInvalid,
+        ]);
     }
 
     private function createRegisterForm(CreateUserRequest $createUserRequest, string $inviteCode): FormInterface
diff --git a/src/FormRequest/CreateUserRequest.php b/src/FormRequest/CreateUserRequest.php
index 6016905..5e0b740 100644
--- a/src/FormRequest/CreateUserRequest.php
+++ b/src/FormRequest/CreateUserRequest.php
@@ -39,4 +39,9 @@ class CreateUserRequest
      * @Assert\Length(min="32", max="32")
      */
     public $inviteCode;
+
+    public function __construct(string $inviteCode = null)
+    {
+        $this->inviteCode = $inviteCode;
+    }
 }
\ No newline at end of file
diff --git a/src/User/UserManager.php b/src/User/UserManager.php
index cb686de..ce033cd 100644
--- a/src/User/UserManager.php
+++ b/src/User/UserManager.php
@@ -43,10 +43,9 @@ class UserManager
         return $user;
     }
 
-    public function createUserByInviteCode(string $username, string $password, string $email, string $inviteCode, array $roles = self::DEFAULT_ROLES): User
+    public function createUserByInvite(string $username, string $password, string $email, Invite $invite, array $roles = self::DEFAULT_ROLES): User
     {
-        /** @var Invite $invite */
-        if (null === $invite = $this->inviteRepo->findOneBy(['code' => $inviteCode, 'usedBy' => null])) {
+        if (null !== $invite->getUsedBy()) {
             throw new InvalidInviteException();
         }
 
diff --git a/templates/User/register.html.twig b/templates/User/register.html.twig
index 50491ff..600b184 100644
--- a/templates/User/register.html.twig
+++ b/templates/User/register.html.twig
@@ -1,7 +1,11 @@
 {% extends 'base.html.twig' %}
 
 {% block content %}
+    {% if inviteInvalid %}
+    <h1>Invalid invite</h1>
+    {% else %}
     <div id="form-register">
         {{ form(form) }}
     </div>
+    {% endif %}
 {% endblock %}
\ No newline at end of file