diff --git a/app/Domain/Notifications/Services/Notifications.php b/app/Domain/Notifications/Services/Notifications.php
index 6b67bdcc51..bab76f66b5 100644
--- a/app/Domain/Notifications/Services/Notifications.php
+++ b/app/Domain/Notifications/Services/Notifications.php
@@ -151,7 +151,7 @@ public function processMentions(string $content, string $module, int $moduleId,
                         $mailer->setHtml($emailMessage);
 
                         $taggedUserObject = $this->userRepository->getUser($taggedUser);
-                        if(!empty($taggedUserObject['username'])) {
+                        if (isset($taggedUserObject['username'])) {
                             $mailer->sendMail(array($taggedUserObject['username']), $authorName);
                         }
                     }