diff --git a/core/includes/bootstrap.inc b/core/includes/bootstrap.inc
index ba3d51c..5fcec7b 100644
--- a/core/includes/bootstrap.inc
+++ b/core/includes/bootstrap.inc
@@ -934,6 +934,11 @@ function drupal_set_message($message = NULL, $type = 'status', $repeat = FALSE)
  *   \Drupal::service('messenger')->getMessagesByType() instead.
  */
 function drupal_get_messages($type = NULL, $clear_queue = TRUE) {
+  // Workaround for code that can not check if the service exists.
+  if (!\Drupal::hasService('messenger')) {
+    return array();
+  }
+
   /** @var \Drupal\Core\Messenger\MessengerInterface $messenger */
   $messenger = \Drupal::service('messenger');