diff --git a/src/Symfony/Component/Security/Http/Authenticator/Passport/Badge/CsrfTokenBadge.php b/src/Symfony/Component/Security/Http/Authenticator/Passport/Badge/CsrfTokenBadge.php
index 9f0b4e5d89..53e7064c95 100644
--- a/src/Symfony/Component/Security/Http/Authenticator/Passport/Badge/CsrfTokenBadge.php
+++ b/src/Symfony/Component/Security/Http/Authenticator/Passport/Badge/CsrfTokenBadge.php
@@ -45,7 +45,7 @@ class CsrfTokenBadge implements BadgeInterface
         return $this->csrfTokenId;
     }
 
-    public function getCsrfToken(): string
+    public function getCsrfToken(): ?string
     {
         return $this->csrfToken;
     }