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-rw-r--r--addons/mail/models/mail_thread.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/addons/mail/models/mail_thread.py b/addons/mail/models/mail_thread.py
index 25ba71e0e75..f82d1ee1cc8 100644
--- a/addons/mail/models/mail_thread.py
+++ b/addons/mail/models/mail_thread.py
@@ -1210,7 +1210,8 @@ class MailThread(models.AbstractModel):
subtype = 'mail.mt_note'
if message_dict.get('parent_id'):
parent_message = self.env['mail.message'].sudo().browse(message_dict['parent_id'])
- partner_ids = [(4, parent_message.author_id.id)]
+ if parent_message.author_id:
+ partner_ids = [(4, parent_message.author_id.id)]
else:
subtype = 'mail.mt_comment'
new_msg = thread.message_post(subtype=subtype, partner_ids=partner_ids, **message_dict)