diff --git a/src/FixturesKernel.php b/src/FixturesKernel.php
index 4ce9a0b..bce798a 100644
--- a/src/FixturesKernel.php
+++ b/src/FixturesKernel.php
@@ -61,9 +61,8 @@ private function prepareSession(Request $request): void
 
         $cookies = $request->cookies;
 
-        $value = $cookies->get($session->getName());
-        if ($value !== null) {
-            $session->setId((string) $value);
+        if ($cookies->has($session->getName())) {
+            $session->setId($cookies->getString($session->getName()));
         } else {
             $session->migrate(false);
         }