From 4b9f2e0ff72dc004ad75bd3dc8b9f1e47ae3006c Mon Sep 17 00:00:00 2001
From: Mark McDowall <mark@mcdowall.ca>
Date: Wed, 26 Jul 2017 07:17:47 -0700
Subject: [PATCH] Guard against null reference exception when parsing newznab
 capabilities

Closes #2054
---
 .../Newznab/NewznabCapabilitiesProvider.cs         | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/NzbDrone.Core/Indexers/Newznab/NewznabCapabilitiesProvider.cs b/src/NzbDrone.Core/Indexers/Newznab/NewznabCapabilitiesProvider.cs
index 137559195..1c955c75d 100644
--- a/src/NzbDrone.Core/Indexers/Newznab/NewznabCapabilitiesProvider.cs
+++ b/src/NzbDrone.Core/Indexers/Newznab/NewznabCapabilitiesProvider.cs
@@ -85,7 +85,19 @@ namespace NzbDrone.Core.Indexers.Newznab
         {
             var capabilities = new NewznabCapabilities();
 
-            var xmlRoot = XDocument.Parse(response.Content).Element("caps");
+            var xDoc = XDocument.Parse(response.Content);
+
+            if (xDoc == null)
+            {
+                throw new XmlException("Invalid XML");
+            }
+
+            var xmlRoot = xDoc.Element("caps");
+
+            if (xmlRoot == null)
+            {
+                throw new XmlException("Unexpected XML");
+            }
 
             var xmlLimits = xmlRoot.Element("limits");
             if (xmlLimits != null)