diff --git a/sale_report_delivered_subtotal/reports/sale_report.py b/sale_report_delivered_subtotal/reports/sale_report.py
index 52f30b17..3edee830 100644
--- a/sale_report_delivered_subtotal/reports/sale_report.py
+++ b/sale_report_delivered_subtotal/reports/sale_report.py
@@ -14,10 +14,12 @@ def _query(self, with_clause="", fields=None, groupby="", from_clause=""):
         if fields is None:
             fields = {}
         select_str_price = """ ,
-            sum((l.price_subtotal /
-                 coalesce(nullif(l.product_uom_qty, 0), 1)
-                ) * l.qty_delivered)
-            as price_subtotal_delivered
+        sum(
+            CASE WHEN l.price_subtotal <> 0
+                THEN (l.price_subtotal / l.product_uom_qty)
+                ELSE l.price_reduce
+            END
+            * l.qty_delivered) as price_subtotal_delivered
         """
         select_str_weight = """ ,
             sum(p.weight * l.qty_delivered /