diff --git a/addons/sale/static/src/js/sale_portal_sidebar.js b/addons/sale/static/src/js/sale_portal_sidebar.js
index 2b404ba122f..f78623e42b8 100644
--- a/addons/sale/static/src/js/sale_portal_sidebar.js
+++ b/addons/sale/static/src/js/sale_portal_sidebar.js
@@ -26,7 +26,7 @@ publicWidget.registry.SalePortalSidebar = PortalSidebar.extend({
         this._generateMenu();
         // After signature, automatically open the popup for payment
         if ($.bbq.getState('allow_payment') === 'yes' && this.$('#o_sale_portal_paynow').length) {
-            this.$('#o_sale_portal_paynow').trigger('click');
+            this.el.querySelector('#o_sale_portal_paynow').click();
             $.bbq.removeState('allow_payment');
         }
         return def;