diff --git a/app/controllers/messages.php b/app/controllers/messages.php
index f8871dd3dc0b57dcc91393f76fa02edee06fdf51..d4f1dc90031c37ce4e0111fed6b10b276693c2ae 100644
--- a/app/controllers/messages.php
+++ b/app/controllers/messages.php
@@ -262,7 +262,7 @@ class MessagesController extends AuthenticatedController {
 
                         $user = new MessageUser();
                         $user->setData(['user_id' => $member['user_id'], 'snd_rec' => 'rec']);
-                        $this->default_message->receivers[] = $user;
+                        $this->default_message->receivers->append($user);
                     }
                 }
             }