From 873c7dc65d061fb8bf5cd5d3ac27fac7ad586f99 Mon Sep 17 00:00:00 2001
From: Raphael Michel <mail@raphaelmichel.de>
Date: Fri, 23 Dec 2016 11:02:29 +0100
Subject: [PATCH] Race conditions can lead to duplicate CachedTickets

---
 src/pretix/presale/views/order.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/pretix/presale/views/order.py b/src/pretix/presale/views/order.py
index 934ddcca5..df3195c0f 100644
--- a/src/pretix/presale/views/order.py
+++ b/src/pretix/presale/views/order.py
@@ -509,9 +509,9 @@ class OrderDownload(EventViewMixin, OrderDetailMixin, View):
             return redirect(self.get_order_url())
 
         try:
-            ct = CachedTicket.objects.get(
+            ct = CachedTicket.objects.filter(
                 order_position=self.order_position, provider=self.output.identifier
-            )
+            ).last()
         except CachedTicket.DoesNotExist:
             ct = None