diff --git a/src/Bundle/ChillCalendarBundle/RemoteCalendar/Connector/MSGraph/MapCalendarToUser.php b/src/Bundle/ChillCalendarBundle/RemoteCalendar/Connector/MSGraph/MapCalendarToUser.php
index 504d48ffc..563bd3a38 100644
--- a/src/Bundle/ChillCalendarBundle/RemoteCalendar/Connector/MSGraph/MapCalendarToUser.php
+++ b/src/Bundle/ChillCalendarBundle/RemoteCalendar/Connector/MSGraph/MapCalendarToUser.php
@@ -22,6 +22,7 @@ use Chill\MainBundle\Entity\User;
 use DateTimeImmutable;
 use LogicException;
 use Psr\Log\LoggerInterface;
+use Symfony\Contracts\HttpClient\Exception\ClientExceptionInterface;
 use Symfony\Contracts\HttpClient\HttpClientInterface;
 use function array_key_exists;
 
@@ -74,9 +75,18 @@ class MapCalendarToUser
 
     public function getDefaultUserCalendar(string $idOrUserPrincipalName): ?array
     {
-        $value = $this->machineHttpClient->request('GET', "users/{$idOrUserPrincipalName}/calendars", [
-            'query' => ['$filter' => 'isDefaultCalendar eq true'],
-        ])->toArray()['value'];
+        try {
+            $value = $this->machineHttpClient->request('GET', "users/{$idOrUserPrincipalName}/calendars", [
+                'query' => ['$filter' => 'isDefaultCalendar eq true'],
+            ])->toArray()['value'];
+        } catch (ClientExceptionInterface $e) {
+            $this->logger->error('[MapCalendarToUser] Error while listing calendars for a user', [
+                'http_status_code' => $e->getResponse()->getStatusCode(),
+                'id_user' => $idOrUserPrincipalName,
+            ]);
+
+            return null;
+        }
 
         return $value[0] ?? null;
     }