diff --git a/migrations/Version20210221204057.php b/migrations/Version20210221204057.php
index 2761f9c..9b02ef0 100644
--- a/migrations/Version20210221204057.php
+++ b/migrations/Version20210221204057.php
@@ -12,20 +12,22 @@
  */
 final class Version20210221204057 extends AbstractMigration
 {
-    public function getDescription() : string
+    public function getDescription(): string
     {
-        return '';
+        return "";
     }
 
-    public function up(Schema $schema) : void
+    public function up(Schema $schema): void
     {
         // this up() migration is auto-generated, please modify it to your needs
-        $this->addSql('CREATE TABLE site (host VARCHAR(255) NOT NULL, title VARCHAR(255) NOT NULL, messages_monday VARCHAR(255) NOT NULL, messages_tuesday VARCHAR(255) NOT NULL, messages_wednesday VARCHAR(255) NOT NULL, messages_thursday VARCHAR(255) NOT NULL, messages_friday VARCHAR(255) NOT NULL, messages_saturday VARCHAR(255) NOT NULL, messages_sunday VARCHAR(255) NOT NULL, PRIMARY KEY(host))');
+        $this->addSql(
+            "CREATE TABLE site (host VARCHAR(255) NOT NULL, title VARCHAR(255) NOT NULL, messages_monday VARCHAR(255) NOT NULL, messages_tuesday VARCHAR(255) NOT NULL, messages_wednesday VARCHAR(255) NOT NULL, messages_thursday VARCHAR(255) NOT NULL, messages_friday VARCHAR(255) NOT NULL, messages_saturday VARCHAR(255) NOT NULL, messages_sunday VARCHAR(255) NOT NULL, PRIMARY KEY(host))"
+        );
     }
 
-    public function down(Schema $schema) : void
+    public function down(Schema $schema): void
     {
         // this down() migration is auto-generated, please modify it to your needs
-        $this->addSql('DROP TABLE site');
+        $this->addSql("DROP TABLE site");
     }
 }
diff --git a/src/Controller/SiteController.php b/src/Controller/SiteController.php
index cc1d84d..e836b9c 100644
--- a/src/Controller/SiteController.php
+++ b/src/Controller/SiteController.php
@@ -8,6 +8,7 @@
 use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Exception\NotFoundHttpException;
 use Symfony\Component\Routing\Annotation\Route;
 
 /**
@@ -24,6 +25,9 @@ public function index(
     ): Response {
         $host = $request->get("host", $request->getHost());
         $site = $siteRepository->findOneByHost($host);
+        if (null === $site) {
+            throw new NotFoundHttpException();
+        }
         $now = $this->getNow($request);
         $message = "…";
         if (null !== $site && $site->getMessages()) {
diff --git a/src/Entity/Site.php b/src/Entity/Site.php
index dbf2d13..a46ffa0 100644
--- a/src/Entity/Site.php
+++ b/src/Entity/Site.php
@@ -30,6 +30,7 @@ class Site
 
     /**
      * @ORM\Column(type="string", length=255)
+     * @Assert\NotBlank()
      */
     private $title;