diff --git a/__openerp__.py b/__openerp__.py
index 8682818..db1c8da 100644
--- a/__openerp__.py
+++ b/__openerp__.py
@@ -1,6 +1,6 @@
 {
     'name' : 'Sentbox',
-    'version' : '1.0.0',
+    'version' : '1.0.1',
     'author' : 'IT-Projects LLC, Ivan Yelizariev',
     'license': 'LGPL-3',
     'category' : 'Social Network',
diff --git a/models.py b/models.py
index 27e0425..2f9257b 100644
--- a/models.py
+++ b/models.py
@@ -1,4 +1,5 @@
-from openerp import api, models, fields, SUPERUSER_ID
+from openerp import api, models, fields
+
 
 class mail_message(models.Model):
     _inherit = 'mail.message'
@@ -6,13 +7,21 @@ class mail_message(models.Model):
     @api.one
     @api.depends('author_id', 'notified_partner_ids')
     def _get_sent(self):
-        self.sent = len(self.notified_partner_ids) > 1 or len(self.notified_partner_ids)==1 and self.notified_partner_ids[0].id != self.author_id.id
+        self.sent = len(self.notified_partner_ids) > 1 or len(self.notified_partner_ids) == 1 and self.author_id and self.notified_partner_ids[0].id != self.author_id.id
 
     sent = fields.Boolean('Sent', compute=_get_sent, help='Was message sent to someone', store=True)
 
+
 class mail_notification(models.Model):
     _inherit = 'mail.notification'
 
     def _notify(self, cr, uid, message_id, **kwargs):
         super(mail_notification, self)._notify(cr, uid, message_id, **kwargs)
         self.pool['mail.message'].browse(cr, uid, message_id)._get_sent()
+
+
+class mail_compose_message(models.TransientModel):
+
+    _inherit = 'mail.compose.message'
+    sent = fields.Boolean('Sent', help='dummy field to fix inherit error')
+