diff --git a/addons/calendar/models/mail_message.py b/addons/calendar/models/mail_message.py
index 426c7a78d52..3d5b6dcae00 100644
--- a/addons/calendar/models/mail_message.py
+++ b/addons/calendar/models/mail_message.py
@@ -28,6 +28,7 @@ class Message(models.Model):
     def _find_allowed_model_wise(self, doc_model, doc_dict):
         if doc_model == 'calendar.event':
             order = self._context.get('order', self.env[doc_model]._order)
-            for virtual_id in self.env[doc_model].browse(doc_dict).get_recurrent_ids([], order=order):
+            records = self.env[doc_model].search([('id', 'in', list(doc_dict))])
+            for virtual_id in records.get_recurrent_ids([], order=order):
                 doc_dict.setdefault(virtual_id, doc_dict[get_real_ids(virtual_id)])
         return super(Message, self)._find_allowed_model_wise(doc_model, doc_dict)