diff --git a/addons/account/views/report_invoice.xml b/addons/account/views/report_invoice.xml
index a435ae4695b..2c493fda8bf 100644
--- a/addons/account/views/report_invoice.xml
+++ b/addons/account/views/report_invoice.xml
@@ -69,8 +69,9 @@
                         </thead>
                         <tbody class="invoice_tbody">
                             <t t-set="current_subtotal" t-value="0"/>
+                            <t t-set="lines" t-value="o.invoice_line_ids.sorted(key=lambda l: (-l.sequence, l.date, l.move_name, -l.id), reverse=True)"/>
 
-                            <t t-foreach="o.invoice_line_ids.sorted(key=lambda l: (-l.sequence, l.date, l.move_name, -l.id), reverse=True)" t-as="line">
+                            <t t-foreach="lines" t-as="line">
                                 <t t-set="current_subtotal" t-value="current_subtotal + line.price_subtotal" groups="account.group_show_line_subtotals_tax_excluded"/>
                                 <t t-set="current_subtotal" t-value="current_subtotal + line.price_total" groups="account.group_show_line_subtotals_tax_included"/>
 
@@ -109,7 +110,7 @@
                                     </t>
                                 </tr>
 
-                                <t t-if="current_section and (line_last or o.invoice_line_ids[line_index+1].display_type == 'line_section')">
+                                <t t-if="current_section and (line_last or lines[line_index+1].display_type == 'line_section')">
                                     <tr class="is-subtotal text-right">
                                         <td colspan="99">
                                             <strong class="mr16">Subtotal</strong>