diff --git a/application/Calendar/CalendarModel.php b/application/Calendar/CalendarModel.php
index fe6979d32..e6f3bd644 100644
--- a/application/Calendar/CalendarModel.php
+++ b/application/Calendar/CalendarModel.php
@@ -478,6 +478,7 @@ class CalendarModel
         $type = ($r->type);
         $busy = ($r->busy);
         $users = ($r->users);
+        $attendees = ($r->attendees);
         foreach ($users as $key => $value) {
             $user_id = $value;
         }
@@ -587,6 +588,8 @@ class CalendarModel
 
             $updateArray['attachments'] = $attachments;
         }
+        if ($attendees)
+            $updateArray['attendees'] = $attendees;
         $json_data = json_encode($updateArray);
         $data = [];
         $data['ms_user_id'] = $microsoft_user_id;