diff --git a/addons/google_calendar/models/google_calendar.py b/addons/google_calendar/models/google_calendar.py
index 79af1da72d8..f231b25e18f 100644
--- a/addons/google_calendar/models/google_calendar.py
+++ b/addons/google_calendar/models/google_calendar.py
@@ -443,7 +443,9 @@ class GoogleCalendar(models.AbstractModel):
                 if google_attendee.get('found'):
                     continue
 
-                attendee = ResPartner.search([('email', '=', google_attendee['email'])], limit=1)
+                attendee = ResPartner.search([('email', '=ilike', google_attendee['email']), ('user_ids', '!=', False)], limit=1)
+                if not attendee:
+                    attendee = ResPartner.search([('email', '=ilike', google_attendee['email'])], limit=1)
                 if not attendee:
                     data = {
                         'email': partner_email,