diff --git a/addons/portal/models/portal_mixin.py b/addons/portal/models/portal_mixin.py
index f3e86d80ccd..1ff8a2319a0 100644
--- a/addons/portal/models/portal_mixin.py
+++ b/addons/portal/models/portal_mixin.py
@@ -62,9 +62,9 @@ class PortalMixin(models.AbstractModel):
 
     def _notify_get_groups(self):
         access_token = self._portal_ensure_token()
-        customer = self['partner_id']
         groups = super(PortalMixin, self)._notify_get_groups()
-        if access_token and customer:
+        if access_token and 'partner_id' in self._fields and self['partner_id']:
+            customer = self['partner_id']
             additional_params = {
                 'access_token': self.access_token,
             }
diff --git a/doc/cla/corporate/tecnativa.md b/doc/cla/corporate/tecnativa.md
index 5249fe08571..8f3bd06dcc9 100644
--- a/doc/cla/corporate/tecnativa.md
+++ b/doc/cla/corporate/tecnativa.md
@@ -21,3 +21,5 @@ David Vidal david.vidal@tecnativa.com https://github.com/chienandalu
 Cristina Martín cristina.martin@tecnativa.com https://github.com/cristinamartinrod (up to 2019-04-30)
 Ernesto Tejeda ernesto.tejeda@tecnativa.com https://github.com/ernestotejeda
 Alexandre Díaz alexandre.diaz@tecnativa.com https://github.com/Tardo
+Víctor Martínez victor.martinez@tecnativa.com https://github.com/victoralmau
+João Marques joao.marques@tecnativa.com https://github.com/joao-p-marques