diff --git a/src/Symfony/Bridge/Twig/AppVariable.php b/src/Symfony/Bridge/Twig/AppVariable.php
index 6cdbaa8370811..88612279d55ba 100644
--- a/src/Symfony/Bridge/Twig/AppVariable.php
+++ b/src/Symfony/Bridge/Twig/AppVariable.php
@@ -13,7 +13,7 @@
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\RequestStack;
-use Symfony\Component\HttpFoundation\Session\Session;
+use Symfony\Component\HttpFoundation\Session\SessionInterface;
use Symfony\Component\Security\Core\Authentication\Token\Storage\TokenStorageInterface;
use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
use Symfony\Component\Security\Core\User\UserInterface;
@@ -93,7 +93,7 @@ public function getRequest(): ?Request
/**
* Returns the current session.
*/
- public function getSession(): ?Session
+ public function getSession(): ?SessionInterface
{
if (!isset($this->requestStack)) {
throw new \RuntimeException('The "app.session" variable is not available.');
@@ -143,6 +143,12 @@ public function getFlashes(string|array $types = null): array
return [];
}
+ // In 7.0 (when symfony/http-foundation: 6.4 is required) this can be updated to
+ // check if the session is an instance of FlashBagAwareSessionInterface
+ if (!method_exists($session, 'getFlashBag')) {
+ return [];
+ }
+
if (null === $types || '' === $types || [] === $types) {
return $session->getFlashBag()->all();
}
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