diff --git a/addons/website_event_track/models/website_event_track.py b/addons/website_event_track/models/website_event_track.py
index 969bef0fa61..e14670f56e4 100644
--- a/addons/website_event_track/models/website_event_track.py
+++ b/addons/website_event_track/models/website_event_track.py
@@ -85,7 +85,8 @@ class Track(models.Model):
     def _compute_website_url(self):
         super(Track, self)._compute_website_url()
         for track in self:
-            track.website_url = '/event/%s/track/%s' % (slug(track.event_id), slug(track))
+            if not isinstance(track.id, models.NewId):
+                track.website_url = '/event/%s/track/%s' % (slug(track.event_id), slug(track))
 
     @api.model
     def read_group(self, domain, fields, groupby, offset=0, limit=None, orderby=False, lazy=True):