diff --git a/addons/im_livechat/models/mail_message.py b/addons/im_livechat/models/mail_message.py
index 8a5e9f42070..4060e9906ea 100644
--- a/addons/im_livechat/models/mail_message.py
+++ b/addons/im_livechat/models/mail_message.py
@@ -39,10 +39,8 @@ class MailMessage(models.Model):
                 if message_sudo.author_id:
                     vals.pop('email_from')
                 if message_sudo.author_id.user_livechat_username:
-                    vals['author'] = {
-                        'id': message_sudo.author_id.id,
-                        'user_livechat_username': message_sudo.author_id.user_livechat_username,
-                    }
+                    del vals['author']['name']
+                    vals['author']['user_livechat_username'] = message_sudo.author_id.user_livechat_username
                 if discuss_channel.chatbot_current_step_id \
                         and message_sudo.author_id == discuss_channel.chatbot_current_step_id.chatbot_script_id.operator_partner_id:
                     chatbot_message_id = self.env['chatbot.message'].sudo().search([
diff --git a/addons/im_livechat/tests/test_get_discuss_channel.py b/addons/im_livechat/tests/test_get_discuss_channel.py
index ba8d3f36c13..24e21b2c2a2 100644
--- a/addons/im_livechat/tests/test_get_discuss_channel.py
+++ b/addons/im_livechat/tests/test_get_discuss_channel.py
@@ -160,6 +160,7 @@ class TestGetDiscussChannel(TestImLivechatCommon):
         channel.with_user(operator).message_post(body='Hello', message_type='comment', subtype_xmlid='mail.mt_comment')
         message_formats = channel.with_user(None).sudo()._channel_fetch_message()
         self.assertEqual(len(message_formats), 1)
+        self.assertNotIn('name', message_formats[0]['author'])
         self.assertEqual(message_formats[0]['author']['id'], operator.partner_id.id)
         self.assertEqual(message_formats[0]['author']['user_livechat_username'], operator.livechat_username)
         self.assertFalse(message_formats[0].get('email_from'), "should not send email_from to livechat user")
diff --git a/addons/im_livechat/tests/test_message.py b/addons/im_livechat/tests/test_message.py
index 95a12d3533d..daef9d8e33d 100644
--- a/addons/im_livechat/tests/test_message.py
+++ b/addons/im_livechat/tests/test_message.py
@@ -22,7 +22,7 @@ class TestImLivechatMessage(HttpCase):
                 'odoobot_state': 'disabled',
                 'signature': '--\nErnest',
             },
-            {'name': 'test1', 'login': 'test1', 'password': self.password, 'email': 'test1@example.com'},
+            {'name': 'test1', 'login': 'test1', 'password': self.password, 'email': 'test1@example.com', 'livechat_username': 'chuck'},
         ])
 
     @users('emp')
@@ -57,7 +57,7 @@ class TestImLivechatMessage(HttpCase):
             'author': {
                 'id': self.users[1].partner_id.id,
                 'is_company': self.users[1].partner_id.is_company,
-                'name': "test1",
+                'user_livechat_username': self.users[1].livechat_username,
                 'type': "partner",
                 'user': {
                     'id': self.users[1].id,