diff --git a/addons/sale_stock/models/account_invoice.py b/addons/sale_stock/models/account_invoice.py
index 084ffbd3706..a6dccfbc01c 100644
--- a/addons/sale_stock/models/account_invoice.py
+++ b/addons/sale_stock/models/account_invoice.py
@@ -49,7 +49,8 @@ class AccountInvoiceLine(models.Model):
                 qty_to_consider = invoiced_qty - qty_done
             qty_to_consider = min(qty_to_consider, quantity - qty_delivered)
             qty_delivered += qty_to_consider
-            average_price_unit = (average_price_unit * (qty_delivered - qty_to_consider) + move.price_unit * qty_to_consider) / qty_delivered
+            if qty_delivered:
+                average_price_unit = (average_price_unit * (qty_delivered - qty_to_consider) + move.price_unit * qty_to_consider) / qty_delivered
             if qty_delivered == quantity:
                 break
         return average_price_unit