diff --git a/src/Drupal/DrupalExtension/Manager/DrupalAuthenticationManager.php b/src/Drupal/DrupalExtension/Manager/DrupalAuthenticationManager.php
index a6207eaf..49fede77 100644
--- a/src/Drupal/DrupalExtension/Manager/DrupalAuthenticationManager.php
+++ b/src/Drupal/DrupalExtension/Manager/DrupalAuthenticationManager.php
@@ -130,7 +130,10 @@ public function loggedIn()
      */
     public function fastLogout()
     {
-        $this->getSession()->reset();
-        $this->userManager->setCurrentUser(false);
+        $session = $this->getSession();
+        if ($session->isStarted()) {
+          $session->reset();
+          $this->userManager->setCurrentUser(FALSE);
+        }
     }
 }