diff --git a/addons/mail/models/mail_channel.py b/addons/mail/models/mail_channel.py
index f82a73304c4..ac5b6de4cd6 100644
--- a/addons/mail/models/mail_channel.py
+++ b/addons/mail/models/mail_channel.py
@@ -983,7 +983,7 @@ class Channel(models.Model):
         """ Hook for website_livechat channel unpin and cleaning """
         self.ensure_one()
         channel_partners = self.env['mail.channel.partner'].search(
-            [('partner_id', '=', self.env.user.partner_id.id), ('channel_id', '=', self.id)])
+            [('partner_id', '=', self.env.user.partner_id.id), ('channel_id', '=', self.id), ('is_pinned', '!=', pinned)])
         self.env['bus.bus'].sendone((self._cr.dbname, 'res.partner', self.env.user.partner_id.id), self.channel_info('unsubscribe' if not pinned else False)[0])
         if channel_partners:
             channel_partners.write({'is_pinned': pinned})