diff --git a/addons/account/models/account_move.py b/addons/account/models/account_move.py
index 95ec93b9f8b..ba10bcbe676 100644
--- a/addons/account/models/account_move.py
+++ b/addons/account/models/account_move.py
@@ -4786,7 +4786,7 @@ class AccountMove(models.Model):
             'in_receipt': _('Purchase Receipt Created'),
         }[self.move_type]
 
-    def _notify_by_email_prepare_rendering_context(self, message, msg_vals, model_description=False,
+    def _notify_by_email_prepare_rendering_context(self, message, msg_vals=False, model_description=False,
                                                    force_email_company=False, force_email_lang=False):
         # EXTENDS mail mail.thread
         render_context = super()._notify_by_email_prepare_rendering_context(
diff --git a/addons/purchase/models/purchase_order.py b/addons/purchase/models/purchase_order.py
index 4e81661553a..70843b3c6ca 100644
--- a/addons/purchase/models/purchase_order.py
+++ b/addons/purchase/models/purchase_order.py
@@ -376,7 +376,7 @@ class PurchaseOrder(models.Model):
 
         return groups
 
-    def _notify_by_email_prepare_rendering_context(self, message, msg_vals, model_description=False,
+    def _notify_by_email_prepare_rendering_context(self, message, msg_vals=False, model_description=False,
                                                    force_email_company=False, force_email_lang=False):
         render_context = super()._notify_by_email_prepare_rendering_context(
             message, msg_vals, model_description=model_description,
diff --git a/addons/sale/models/sale_order.py b/addons/sale/models/sale_order.py
index 73a27662d52..ec99b18a3c0 100644
--- a/addons/sale/models/sale_order.py
+++ b/addons/sale/models/sale_order.py
@@ -1495,7 +1495,7 @@ class SaleOrder(models.Model):
 
         return groups
 
-    def _notify_by_email_prepare_rendering_context(self, message, msg_vals, model_description=False,
+    def _notify_by_email_prepare_rendering_context(self, message, msg_vals=False, model_description=False,
                                                    force_email_company=False, force_email_lang=False):
         render_context = super()._notify_by_email_prepare_rendering_context(
             message, msg_vals, model_description=model_description,