diff --git a/addons/auth_signup/models/res_partner.py b/addons/auth_signup/models/res_partner.py
index db66467d7dd..e0fbb6a34d2 100644
--- a/addons/auth_signup/models/res_partner.py
+++ b/addons/auth_signup/models/res_partner.py
@@ -109,7 +109,7 @@ class ResPartner(models.Model):
 
         allow_signup = self.env['res.users']._get_signup_invitation_scope() == 'b2c'
         for partner in self:
-            if allow_signup and not partner.user_ids:
+            if allow_signup and not partner.sudo().user_ids:
                 partner = partner.sudo()
                 partner.signup_prepare()
                 res[partner.id]['auth_signup_token'] = partner.signup_token