Fixes

src/pretix/presale/checkoutflow.py

@@ -712,7 +712,7 @@ class ConfirmStep(CartMixin, AsyncAction, TemplateFlowStep):
                        [p.id for p in self.positions], self.cart_session.get('email'),
                        translation.get_language(), self.invoice_address.pk, meta_info,
                        request.sales_channel, self.cart_session.get('gift_cards'),
-                       self.cart_session['shown_total'])
+                       self.cart_session.get('shown_total'))
 
     def get_success_message(self, value):
         create_empty_cart_id(self.request)

src/tests/presale/test_checkout.py

@@ -1379,6 +1379,7 @@ class CheckoutTestCase(BaseCheckoutTestCase, TestCase):
 
         cr1.voucher = v
         cr1.save()
+        self.client.get('/%s/%s/checkout/confirm/' % (self.orga.slug, self.event.slug), follow=True)
         response = self.client.post('/%s/%s/checkout/confirm/' % (self.orga.slug, self.event.slug), follow=True)
         doc = BeautifulSoup(response.rendered_content, "lxml")
         self.assertEqual(len(doc.select(".thank-you")), 1)