diff --git a/addons/google_calendar/models/calendar.py b/addons/google_calendar/models/calendar.py
index ceb6eeea4ed..12cb2e476ba 100644
--- a/addons/google_calendar/models/calendar.py
+++ b/addons/google_calendar/models/calendar.py
@@ -142,8 +142,10 @@ class Meeting(models.Model):
                 # Create new attendees
                 if attendee[2].get('self'):
                     partner = self.env.user.partner_id
-                else:
+                elif attendee[1]:
                     partner = attendee[1]
+                else:
+                    continue
                 attendee_commands += [(0, 0, {'state': attendee[2].get('responseStatus'), 'partner_id': partner.id})]
                 partner_commands += [(4, partner.id)]
                 if attendee[2].get('displayName') and not partner.name:
diff --git a/addons/microsoft_calendar/models/calendar.py b/addons/microsoft_calendar/models/calendar.py
index de66f23fe95..d3eb78fbab7 100644
--- a/addons/microsoft_calendar/models/calendar.py
+++ b/addons/microsoft_calendar/models/calendar.py
@@ -174,7 +174,7 @@ class Meeting(models.Model):
             if email in attendees_by_emails:
                 # Update existing attendees
                 commands_attendee += [(1, attendees_by_emails[email].id, {'state': state})]
-            else:
+            elif attendee[1]:
                 # Create new attendees
                 partner = attendee[1]
                 commands_attendee += [(0, 0, {'state': state, 'partner_id': partner.id})]