diff --git a/app/Models/Message.php b/app/Models/Message.php
index 93467ce..4d533e6 100644
--- a/app/Models/Message.php
+++ b/app/Models/Message.php
@@ -41,8 +41,16 @@ class Message extends Model
                 }
                 // ? Is message author is admin ?
                 if ($messageUser->isAdmin()) {
-                    $ticket->subscriptions()->attach($messageUser);
-                    \session()->flash('info', trans('Vous avez été inscrit.'));
+                    // TODO: investigate why this make errors on prod,
+                    // https://supportweb.ldc.fr/ticket/583/message/create
+                    // SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry '583-8' for key 'PRIMARY'
+                    // $ticket->subscriptions()->attach($messageUser);
+
+                    // Add subscription
+                    if (!$messageUser->subscriptions()->find($ticket->id)) {
+                        $messageUser->subscriptions()->attach($ticket->id);
+                        \session()->flash('info', trans('Vous avez été inscrit.'));
+                    }
                 }
                 // * Send mail to other subscribed users
                 event(new NotifySubscriptions(