diff --git a/src/Connection/Connector.php b/src/Connection/Connector.php
index 232ae9a..6a04247 100644
--- a/src/Connection/Connector.php
+++ b/src/Connection/Connector.php
@@ -207,7 +207,7 @@ public function getSession(): Session|SessionInterface
     /**
      * Returns the access token saved in the session, if any.
      */
-    public function getAccessToken(): false|string
+    public function getAccessToken(): ?string
     {
         return $this->session->get('accessToken');
     }