From 67d5c1ccadb4021af1e5191a8a6ed9245c84b128 Mon Sep 17 00:00:00 2001
From: Raphael Michel <mail@raphaelmichel.de>
Date: Wed, 29 May 2019 09:10:52 +0200
Subject: [PATCH] Refs #1307 -- Fix crash when assigning a navigation parent
 without a children list

---
 src/pretix/control/navigation.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/pretix/control/navigation.py b/src/pretix/control/navigation.py
index 3e532b18b..a7a329fd3 100644
--- a/src/pretix/control/navigation.py
+++ b/src/pretix/control/navigation.py
@@ -474,6 +474,8 @@ def merge_in(nav, newnav):
         if 'parent' in item:
             parents = [n for n in nav if n['url'] == item['parent']]
             if parents:
+                if 'children' not in parents[0]:
+                    parents[0]['children'] = []
                 parents[0]['children'].append(item)
         else:
             nav.append(item)