diff --git a/src/Repository/NoteRepository.php b/src/Repository/NoteRepository.php
index f3eea13..e7151a6 100644
--- a/src/Repository/NoteRepository.php
+++ b/src/Repository/NoteRepository.php
@@ -19,13 +19,17 @@ class NoteRepository extends ServiceEntityRepository
 
     public function getLast4Notes(?User $user): array
     {
+        if (!$user) {
+            return [];
+        }
         $ret = $this->createQueryBuilder('n')
             ->where('n.user = :user')
-            ->setParameter('user', (string) $user->getId())
+            ->setParameter('user', $user->getId()->toBinary())
             ->orderBy('n.date', 'DESC')
             ->setMaxResults(4)
             ->getQuery()
             ->getResult();
+
         return $ret;
     }