diff --git a/packages/framework/src/Component/Error/LogoutExceptionSubscriber.php b/packages/framework/src/Component/Error/LogoutExceptionSubscriber.php
index b35fa5321ac..87d59add81b 100644
--- a/packages/framework/src/Component/Error/LogoutExceptionSubscriber.php
+++ b/packages/framework/src/Component/Error/LogoutExceptionSubscriber.php
@@ -5,11 +5,11 @@
 namespace Shopsys\FrameworkBundle\Component\Error;
 
 use Shopsys\FrameworkBundle\Component\Domain\Domain;
+use Shopsys\FrameworkBundle\Component\FlashMessage\FlashBagProvider;
 use Shopsys\FrameworkBundle\Component\FlashMessage\FlashMessage;
 use Shopsys\FrameworkBundle\Model\Customer\User\CurrentCustomerUser;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\RedirectResponse;
-use Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface;
 use Symfony\Component\HttpKernel\Event\ExceptionEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
 use Symfony\Component\Routing\RouterInterface;
@@ -18,9 +18,9 @@
 class LogoutExceptionSubscriber implements EventSubscriberInterface
 {
     /**
-     * @var \Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface
+     * @var \Shopsys\FrameworkBundle\Component\FlashMessage\FlashBagProvider
      */
-    protected $flashBag;
+    protected FlashBagProvider $flashBagProvider;
 
     /**
      * @var \Shopsys\FrameworkBundle\Model\Customer\User\CurrentCustomerUser
@@ -38,18 +38,18 @@ class LogoutExceptionSubscriber implements EventSubscriberInterface
     protected $domain;
 
     /**
-     * @param \Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface $flashBag
+     * @param \Shopsys\FrameworkBundle\Component\FlashMessage\FlashBagProvider $flashBagProvider
      * @param \Shopsys\FrameworkBundle\Model\Customer\User\CurrentCustomerUser $currentCustomerUser
      * @param \Symfony\Component\Routing\RouterInterface $router
      * @param \Shopsys\FrameworkBundle\Component\Domain\Domain $domain
      */
     public function __construct(
-        FlashBagInterface $flashBag,
+        FlashBagProvider $flashBagProvider,
         CurrentCustomerUser $currentCustomerUser,
         RouterInterface $router,
         Domain $domain
     ) {
-        $this->flashBag = $flashBag;
+        $this->flashBagProvider = $flashBagProvider;
         $this->currentCustomerUser = $currentCustomerUser;
         $this->router = $router;
         $this->domain = $domain;
@@ -78,7 +78,7 @@ public function onKernelException(ExceptionEvent $event): void
                 $domainId = $this->currentCustomerUser->findCurrentCustomerUser()->getDomainId();
                 $locale = $this->domain->getDomainConfigById($domainId)->getLocale();
 
-                $this->flashBag->add(
+                $this->flashBagProvider->getFlashBag()?->add(
                     FlashMessage::KEY_ERROR,
                     t(
                         'There was an error during logout attempt. If you really want to sign out, please try it again.',
diff --git a/packages/framework/src/Component/FlashMessage/FlashBagProvider.php b/packages/framework/src/Component/FlashMessage/FlashBagProvider.php
new file mode 100644
index 00000000000..c19340c72fb
--- /dev/null
+++ b/packages/framework/src/Component/FlashMessage/FlashBagProvider.php
@@ -0,0 +1,40 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shopsys\FrameworkBundle\Component\FlashMessage;
+
+use Symfony\Component\HttpFoundation\RequestStack;
+use Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface;
+
+class FlashBagProvider
+{
+    /**
+     * @var \Symfony\Component\HttpFoundation\RequestStack
+     */
+    protected RequestStack $requestStack;
+
+    /**
+     * @param \Symfony\Component\HttpFoundation\RequestStack $requestStack
+     */
+    public function __construct(RequestStack $requestStack)
+    {
+        $this->requestStack = $requestStack;
+    }
+
+    /**
+     * @return \Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface|null
+     */
+    public function getFlashBag(): ?FlashBagInterface
+    {
+        $currentRequest = $this->requestStack->getCurrentRequest();
+        if ($currentRequest === null) {
+            return null;
+        }
+
+        /** @var \Symfony\Component\HttpFoundation\Session\Session $session */
+        $session = $currentRequest->getSession();
+
+        return $session->getFlashBag();
+    }
+}
diff --git a/packages/framework/src/Model/Cart/Watcher/CartWatcherFacade.php b/packages/framework/src/Model/Cart/Watcher/CartWatcherFacade.php
index 1b397e1f641..38694a2ab69 100644
--- a/packages/framework/src/Model/Cart/Watcher/CartWatcherFacade.php
+++ b/packages/framework/src/Model/Cart/Watcher/CartWatcherFacade.php
@@ -3,11 +3,11 @@
 namespace Shopsys\FrameworkBundle\Model\Cart\Watcher;
 
 use Doctrine\ORM\EntityManagerInterface;
+use Shopsys\FrameworkBundle\Component\FlashMessage\FlashBagProvider;
 use Shopsys\FrameworkBundle\Component\FlashMessage\FlashMessage;
 use Shopsys\FrameworkBundle\Model\Cart\Cart;
 use Shopsys\FrameworkBundle\Model\Customer\User\CurrentCustomerUser;
 use Shopsys\FrameworkBundle\Model\Product\Exception\ProductNotFoundException;
-use Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface;
 use Twig\Environment;
 
 abstract class CartWatcherFacade
@@ -28,9 +28,9 @@ abstract class CartWatcherFacade
     protected $currentCustomerUser;
 
     /**
-     * @var \Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface
+     * @var \Shopsys\FrameworkBundle\Component\FlashMessage\FlashBagProvider
      */
-    protected $flashBag;
+    protected FlashBagProvider $flashBagProvider;
 
     /**
      * @var \Twig\Environment
@@ -38,20 +38,20 @@ abstract class CartWatcherFacade
     protected $twigEnvironment;
 
     /**
-     * @param \Symfony\Component\HttpFoundation\Session\Flash\FlashBagInterface $flashBag
+     * @param \Shopsys\FrameworkBundle\Component\FlashMessage\FlashBagProvider $flashBagProvider
      * @param \Doctrine\ORM\EntityManagerInterface $em
      * @param \Shopsys\FrameworkBundle\Model\Cart\Watcher\CartWatcher $cartWatcher
      * @param \Shopsys\FrameworkBundle\Model\Customer\User\CurrentCustomerUser $currentCustomerUser
      * @param \Twig\Environment $twigEnvironment
      */
     public function __construct(
-        FlashBagInterface $flashBag,
+        FlashBagProvider $flashBagProvider,
         EntityManagerInterface $em,
         CartWatcher $cartWatcher,
         CurrentCustomerUser $currentCustomerUser,
         Environment $twigEnvironment
     ) {
-        $this->flashBag = $flashBag;
+        $this->flashBagProvider = $flashBagProvider;
         $this->em = $em;
         $this->cartWatcher = $cartWatcher;
         $this->currentCustomerUser = $currentCustomerUser;
@@ -79,7 +79,7 @@ protected function checkModifiedPrices(Cart $cart)
         );
 
         foreach ($modifiedItems as $cartItem) {
-            $this->flashBag->add(FlashMessage::KEY_INFO, $messageTemplate->render(['name' => $cartItem->getName()]));
+            $this->flashBagProvider->getFlashBag()?->add(FlashMessage::KEY_INFO, $messageTemplate->render(['name' => $cartItem->getName()]));
         }
 
         if (count($modifiedItems) > 0) {
@@ -100,12 +100,13 @@ protected function checkNotListableItems(Cart $cart)
             $this->getMessageForNoLongerAvailableExistingProduct()
         );
 
+        $flashBag = $this->flashBagProvider->getFlashBag();
         foreach ($notVisibleItems as $cartItem) {
             try {
                 $productName = $cartItem->getName();
-                $this->flashBag->add(FlashMessage::KEY_ERROR, $messageTemplate->render(['name' => $productName]));
+                $flashBag?->add(FlashMessage::KEY_ERROR, $messageTemplate->render(['name' => $productName]));
             } catch (ProductNotFoundException $e) {
-                $this->flashBag->add(
+                $flashBag?->add(
                     FlashMessage::KEY_ERROR,
                     $this->getMessageForNoLongerAvailableProduct()
                 );