From b0fb52017c5f834a3117c4313a4ecb36b9fd9e6d Mon Sep 17 00:00:00 2001
From: Leigh Morresi <275001+dgtlmoon@users.noreply.github.com>
Date: Wed, 24 Feb 2021 09:56:29 +0100
Subject: [PATCH] Handle the case of someone supplying a bad link

---
 backend/__init__.py | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/backend/__init__.py b/backend/__init__.py
index c5a055f0..101e0094 100644
--- a/backend/__init__.py
+++ b/backend/__init__.py
@@ -253,10 +253,12 @@ def changedetection_app(config=None, datastore_o=None):
         if uuid == 'first':
             uuid= list(datastore.data['watching'].keys()).pop()
 
-
         extra_stylesheets = ['/static/css/diff.css']
-
-        watch = datastore.data['watching'][uuid]
+        try:
+            watch = datastore.data['watching'][uuid]
+        except KeyError:
+            messages.append({'class': 'error', 'message': "No history found for the specified link, bad link?"})
+            return redirect(url_for('index'))
 
         dates = list(watch['history'].keys())
         # Convert to int, sort and back to str again