From 0cbacbb959ac23786dc60b46bcc6949947eea4e3 Mon Sep 17 00:00:00 2001
From: Raphael Michel <mail@raphaelmichel.de>
Date: Tue, 14 Aug 2018 08:56:53 +0200
Subject: [PATCH] Fix checking in something that is checked in multiple times

---
 src/pretix/base/services/checkin.py | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/pretix/base/services/checkin.py b/src/pretix/base/services/checkin.py
index fed025224b..f6c6dca8e2 100644
--- a/src/pretix/base/services/checkin.py
+++ b/src/pretix/base/services/checkin.py
@@ -116,10 +116,13 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
             require_answers
         )
     else:
-        ci, created = Checkin.objects.get_or_create(position=op, list=clist, defaults={
-            'datetime': dt,
-            'nonce': nonce,
-        })
+        try:
+            ci, created = Checkin.objects.get_or_create(position=op, list=clist, defaults={
+                'datetime': dt,
+                'nonce': nonce,
+            })
+        except Checkin.MultipleObjectsReturned:
+            ci, created = Checkin.objects.filter(position=op, list=clist).last(), False
 
     if created or (nonce and nonce == ci.nonce):
         if created: