diff --git a/addons/l10n_ch/models/account_invoice.py b/addons/l10n_ch/models/account_invoice.py
index d8650bd1e03..f0c6eae22ff 100644
--- a/addons/l10n_ch/models/account_invoice.py
+++ b/addons/l10n_ch/models/account_invoice.py
@@ -246,7 +246,10 @@ class AccountMove(models.Model):
         for inv in self:
             if inv.move_type == 'in_invoice' and inv.company_id.country_id.code == "CH":
                 partner_bank = inv.partner_bank_id
-                needs_isr_ref = partner_bank._is_qr_iban() or partner_bank._is_isr_issuer()
+                if partner_bank:
+                    needs_isr_ref = partner_bank._is_qr_iban() or partner_bank._is_isr_issuer()
+                else:
+                    needs_isr_ref = False
                 if needs_isr_ref and not inv._has_isr_ref():
                     inv.l10n_ch_isr_needs_fixing = True
                     continue
diff --git a/addons/l10n_ch_qriban/models/res_bank.py b/addons/l10n_ch_qriban/models/res_bank.py
index 6a8825f3b7e..45c2ddee183 100644
--- a/addons/l10n_ch_qriban/models/res_bank.py
+++ b/addons/l10n_ch_qriban/models/res_bank.py
@@ -37,7 +37,7 @@ class ResPartnerBank(models.Model):
         return super().write(vals)
 
     def _is_qr_iban(self):
-        return self and super(ResPartnerBank, self)._is_qr_iban() or self.l10n_ch_qr_iban
+        return super(ResPartnerBank, self)._is_qr_iban() or self.l10n_ch_qr_iban
 
     def _l10n_ch_get_qr_vals(self, amount, currency, debtor_partner, free_communication, structured_communication):
         qr_vals = super()._l10n_ch_get_qr_vals(amount, currency, debtor_partner, free_communication, structured_communication)