diff --git a/src/Plugin/QueueWorker/CommerceStockNotifyQueue.php b/src/Plugin/QueueWorker/CommerceStockNotifyQueue.php
index c2ec5a2..7aa1111 100644
--- a/src/Plugin/QueueWorker/CommerceStockNotifyQueue.php
+++ b/src/Plugin/QueueWorker/CommerceStockNotifyQueue.php
@@ -111,7 +111,12 @@ class CommerceStockNotifyQueue extends QueueWorkerBase implements ContainerFacto
         ]),
       ];
       // Send a message.
-      $this->mailManager->mail('commerce_stock_notifications', 'commerce_stock_notifications.notify', $data->getEmail(), $user->getPreferredLangcode(), $params);
+      if ($user) {
+        $this->mailManager->mail('commerce_stock_notifications', 'commerce_stock_notifications.notify', $data->getEmail(), $user->getPreferredLangcode(), $params, NULL, TRUE);
+      }
+      else {
+        $this->mailManager->mail('commerce_stock_notifications', 'commerce_stock_notifications.notify', $data->getEmail(), 'en', $params, NULL, TRUE);
+      }
       $time = new DrupalDateTime();
 
       $data->set('sent_time', $time->getTimestamp())->save();