diff --git a/core/includes/install.core.inc b/core/includes/install.core.inc
index 62e078d54e34..ce5ca8ad109d 100644
--- a/core/includes/install.core.inc
+++ b/core/includes/install.core.inc
@@ -145,8 +145,8 @@ function install_drupal($class_loader, $settings = [], callable $callback = NULL
   // next page.
   if ($state['interactive']) {
     // If a session has been initiated in this request, make sure to save it.
-    if ($session = \Drupal::request()->getSession()) {
-      $session->save();
+    if (\Drupal::request()->hasSession()) {
+      \Drupal::request()->getSession()->save();
     }
     if ($state['parameters_changed']) {
       // Redirect to the correct page if the URL parameters have changed.
@@ -657,8 +657,8 @@ function install_run_task($task, &$install_state) {
       $url = Url::fromUri('base:install.php', ['query' => $install_state['parameters'], 'script' => '']);
       $response = batch_process($url, clone $url);
       if ($response instanceof Response) {
-        if ($session = \Drupal::request()->getSession()) {
-          $session->save();
+        if (\Drupal::request()->hasSession()) {
+          \Drupal::request()->getSession()->save();
         }
         // Send the response.
         $response->send();
diff --git a/core/lib/Drupal/Core/Entity/EntityDeleteMultipleAccessCheck.php b/core/lib/Drupal/Core/Entity/EntityDeleteMultipleAccessCheck.php
index 470c1b091504..6e9564caea2a 100644
--- a/core/lib/Drupal/Core/Entity/EntityDeleteMultipleAccessCheck.php
+++ b/core/lib/Drupal/Core/Entity/EntityDeleteMultipleAccessCheck.php
@@ -62,7 +62,7 @@ class EntityDeleteMultipleAccessCheck implements AccessInterface {
    *   Allowed or forbidden, neutral if tempstore is empty.
    */
   public function access(AccountInterface $account, $entity_type_id) {
-    if (!$this->requestStack->getCurrentRequest()->getSession()) {
+    if (!$this->requestStack->getCurrentRequest()->hasSession()) {
       return AccessResult::neutral();
     }
     $selection = $this->tempStore->get($account->id() . ':' . $entity_type_id);
diff --git a/core/modules/big_pipe/src/Controller/BigPipeController.php b/core/modules/big_pipe/src/Controller/BigPipeController.php
index a5f57b14b4ff..da95f6d9dce2 100644
--- a/core/modules/big_pipe/src/Controller/BigPipeController.php
+++ b/core/modules/big_pipe/src/Controller/BigPipeController.php
@@ -42,7 +42,7 @@ class BigPipeController {
     //   the cookie was already set, yet the user is executing this controller;
     // - there is no session, in which case BigPipe is not enabled anyway, so it
     //   is pointless to set this cookie.
-    if ($request->cookies->has(BigPipeStrategy::NOJS_COOKIE) || $request->getSession() === NULL) {
+    if ($request->cookies->has(BigPipeStrategy::NOJS_COOKIE) || !$request->hasSession()) {
       throw new AccessDeniedHttpException();
     }
 
diff --git a/core/modules/comment/src/Controller/CommentController.php b/core/modules/comment/src/Controller/CommentController.php
index 82289bed921c..417b581b75f2 100644
--- a/core/modules/comment/src/Controller/CommentController.php
+++ b/core/modules/comment/src/Controller/CommentController.php
@@ -152,8 +152,8 @@ class CommentController extends ControllerBase {
       $subrequest_url = $entity->toUrl()->setOption('query', ['page' => $page])->toString(TRUE);
       $redirect_request = Request::create($subrequest_url->getGeneratedUrl(), 'GET', $request->query->all(), $request->cookies->all(), [], $request->server->all());
       // Carry over the session to the subrequest.
-      if ($session = $request->getSession()) {
-        $redirect_request->setSession($session);
+      if ($request->hasSession()) {
+        $redirect_request->setSession($request->getSession());
       }
       $request->query->set('page', $page);
       $response = $this->httpKernel->handle($redirect_request, HttpKernelInterface::SUB_REQUEST);