From 605b8f9645f576227b53ab83b86c190f925bca1c Mon Sep 17 00:00:00 2001
From: Leonardo Galli <leonardo.galli@bluewin.ch>
Date: Wed, 26 Jul 2017 23:23:36 +0200
Subject: [PATCH] Fixed: Guard agains null reference exception with newznab
 capabilities.

---
 .../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 f76565d6f..da6fe0038 100644
--- a/src/NzbDrone.Core/Indexers/Newznab/NewznabCapabilitiesProvider.cs
+++ b/src/NzbDrone.Core/Indexers/Newznab/NewznabCapabilitiesProvider.cs
@@ -84,7 +84,19 @@ 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)