diff --git a/addons/account_edi_ubl_cii/models/account_edi_common.py b/addons/account_edi_ubl_cii/models/account_edi_common.py
index 4b9e78d914f..7dc58e54f40 100644
--- a/addons/account_edi_ubl_cii/models/account_edi_common.py
+++ b/addons/account_edi_ubl_cii/models/account_edi_common.py
@@ -599,7 +599,7 @@ class AccountEdiCommon(models.AbstractModel):
         elif net_price_unit is not None:
             price_unit = (net_price_unit + rebate) / basis_qty
         elif price_subtotal is not None:
-            price_unit = (price_subtotal + allow_charge_amount) / billed_qty
+            price_unit = (price_subtotal + allow_charge_amount) / (billed_qty or 1)
         else:
             raise UserError(_("No gross price, net price nor line subtotal amount found for line in xml"))