diff --git a/addons/account/models/chart_template.py b/addons/account/models/chart_template.py
index 1284ce967fc..f357e50294b 100644
--- a/addons/account/models/chart_template.py
+++ b/addons/account/models/chart_template.py
@@ -727,7 +727,7 @@ class WizardMultiChartsAccounts(models.TransientModel):
             if company_id:
                 company = self.env['res.company'].browse(company_id)
                 currency_id = company.on_change_country(company.country_id.id)['value']['currency_id']
-                res.update({'currency_id': currency_id.id})
+                res.update({'currency_id': currency_id})
 
         chart_templates = account_chart_template.search([('visible', '=', True)])
         if chart_templates:
diff --git a/addons/calendar/models/calendar.py b/addons/calendar/models/calendar.py
index 2337ad76e48..ed1d1ea88f8 100644
--- a/addons/calendar/models/calendar.py
+++ b/addons/calendar/models/calendar.py
@@ -1419,7 +1419,7 @@ class Meeting(models.Model):
                     partners_to_notify = meeting.partner_ids.ids
                     event_attendees_changes = attendees_create and real_ids and attendees_create[real_ids[0]]
                     if event_attendees_changes:
-                        partners_to_notify.append(event_attendees_changes['removed_partners'].ids)
+                        partners_to_notify.extend(event_attendees_changes['removed_partners'].ids)
                     self.env['calendar.alarm_manager'].notify_next_alarm(partners_to_notify)
 
             if (values.get('start_date') or values.get('start_datetime') or
diff --git a/odoo/addons/base/res/res_company.py b/odoo/addons/base/res/res_company.py
index 9f240f314fa..29467b078d9 100644
--- a/odoo/addons/base/res/res_company.py
+++ b/odoo/addons/base/res/res_company.py
@@ -246,8 +246,8 @@ class Company(models.Model):
         self.ensure_one()
         currency_id = self._get_user_currency()
         if country_id:
-            currency_id = self.env['res.country'].browse(country_id).currency_id.id
-        return {'value': {'currency_id': currency_id}}
+            currency_id = self.env['res.country'].browse(country_id).currency_id
+        return {'value': {'currency_id': currency_id.id}}
 
     @api.onchange('country_id')
     def _onchange_country_id_wrapper(self):