diff --git a/addons/website_event_online/models/website_visitor.py b/addons/website_event_online/models/website_visitor.py
index bd767cab171..078e4f03296 100644
--- a/addons/website_event_online/models/website_visitor.py
+++ b/addons/website_event_online/models/website_visitor.py
@@ -43,7 +43,7 @@ class WebsiteVisitor(models.Model):
         self.flush()
 
         for visitor in self.filtered(lambda visitor: not visitor.email or not visitor.mobile):
-            linked_registrations = visitor.event_registration_ids.sorted('create_date', reverse=True)
+            linked_registrations = visitor.event_registration_ids.sorted(lambda reg: (reg.create_date, reg.id), reverse=False)
             if not visitor.email:
                 visitor.email = next((reg.email for reg in linked_registrations if reg.email), False)
             if not visitor.mobile: