diff --git a/addons/mail/models/mail_channel.py b/addons/mail/models/mail_channel.py
index 37b4d222c26..262fc8aa745 100644
--- a/addons/mail/models/mail_channel.py
+++ b/addons/mail/models/mail_channel.py
@@ -730,7 +730,7 @@ class Channel(models.Model):
         self.ensure_one()
         if self.channel_message_ids.ids:
             last_message_id = self.channel_message_ids.ids[0] # zero is the index of the last message
-            channel_partner = self.env['mail.channel.partner'].search([('channel_id', 'in', self.ids), ('partner_id', '=', self.env.user.partner_id.id)])
+            channel_partner = self.env['mail.channel.partner'].search([('channel_id', 'in', self.ids), ('partner_id', '=', self.env.user.partner_id.id)], limit=1)
             if channel_partner.seen_message_id.id == last_message_id:
                 # last message seen by user is already up-to-date
                 return
@@ -761,7 +761,7 @@ class Channel(models.Model):
             if channel.channel_type != 'chat':
                 return
             last_message_id = channel.channel_message_ids.ids[0] # zero is the index of the last message
-            channel_partner = self.env['mail.channel.partner'].search([('channel_id', '=', channel.id), ('partner_id', '=', self.env.user.partner_id.id)])
+            channel_partner = self.env['mail.channel.partner'].search([('channel_id', '=', channel.id), ('partner_id', '=', self.env.user.partner_id.id)], limit=1)
             if channel_partner.fetched_message_id.id == last_message_id:
                 # last message fetched by user is already up-to-date
                 return