diff --git a/addons/account_check_printing/models/account_payment.py b/addons/account_check_printing/models/account_payment.py
index 555fd9b60a4..12a75b14980 100644
--- a/addons/account_check_printing/models/account_payment.py
+++ b/addons/account_check_printing/models/account_payment.py
@@ -206,7 +206,7 @@ class AccountPayment(models.Model):
 
         multi_stub = self.company_id.account_check_printing_multi_stub
 
-        invoices = self.move_id._get_reconciled_invoices().sorted(key=lambda r: r.invoice_date_due)
+        invoices = self.move_id._get_reconciled_invoices().sorted(key=lambda r: r.invoice_date_due or fields.Date.context_today(self))
         debits = invoices.filtered(lambda r: r.move_type == 'in_invoice')
         credits = invoices.filtered(lambda r: r.move_type == 'in_refund')