diff --git a/addons/account_discount/models/account_invoice.py b/addons/account_discount/models/account_invoice.py
index f62da34e..58924a10 100644
--- a/addons/account_discount/models/account_invoice.py
+++ b/addons/account_discount/models/account_invoice.py
@@ -54,10 +54,11 @@ class AccountInvoice(models.Model):
                 discount_value_ratio = \
                     (self.discount_amount * line.price_subtotal) / \
                     gross_amount
-                discount_per_ratio = \
-                    (discount_value_ratio * 100) / line.price_subtotal
-                line.write({'discount': discount_per_ratio})
-                self._onchange_invoice_line_ids()
+                if discount_value_ratio:
+                    discount_per_ratio = \
+                        (discount_value_ratio * 100) / line.price_subtotal
+                    line.write({'discount': discount_per_ratio})
+                    self._onchange_invoice_line_ids()
         self._check_constrains()
 
     @api.multi
diff --git a/addons/sale/report/invoice_report_templates.xml b/addons/sale/report/invoice_report_templates.xml
index bf57e4d4..e6d4aa7b 100644
--- a/addons/sale/report/invoice_report_templates.xml
+++ b/addons/sale/report/invoice_report_templates.xml
@@ -23,6 +23,7 @@
                         <th t-if="display_discount" class="text-right" groups="sale.group_discount_per_so_line">Disc.(%)</th>
                         <th class="text-right">Taxes</th>
                         <th class="text-right">Amount</th>
+                        <th class="text-right">Total</th>
                     </tr>
                 </thead>
                 <tbody class="invoice_tbody">
diff --git a/addons/sales_discount/models/sale.py b/addons/sales_discount/models/sale.py
index a7c844c5..84fadbec 100644
--- a/addons/sales_discount/models/sale.py
+++ b/addons/sales_discount/models/sale.py
@@ -54,9 +54,10 @@ class SaleOrder(models.Model):
                 discount_value_ratio = \
                     (self.discount_amount *
                      line.price_subtotal) / gross_amount
-                discount_per_ratio = \
-                    (discount_value_ratio * 100) / line.price_subtotal
-                line.write({'discount': discount_per_ratio})
+                if discount_value_ratio:
+                    discount_per_ratio = \
+                        (discount_value_ratio * 100) / line.price_subtotal
+                    line.write({'discount': discount_per_ratio})
 
     @api.onchange('discount_method')
     def onchange_discount_method(self):