From 93ee8491184b8a2c703fe0b4b0cbefc97b8f2d9f Mon Sep 17 00:00:00 2001
From: Leonardo Galli <leonardo.galli@bluewin.ch>
Date: Fri, 11 May 2018 19:29:19 +0200
Subject: [PATCH] Fixed: Broken Newznab testing.

---
 src/NzbDrone.Core/Indexers/Newznab/Newznab.cs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/NzbDrone.Core/Indexers/Newznab/Newznab.cs b/src/NzbDrone.Core/Indexers/Newznab/Newznab.cs
index 573d51937..038e3b894 100644
--- a/src/NzbDrone.Core/Indexers/Newznab/Newznab.cs
+++ b/src/NzbDrone.Core/Indexers/Newznab/Newznab.cs
@@ -99,7 +99,8 @@ namespace NzbDrone.Core.Indexers.Newznab
 
             foreach (var category in categories)
             {
-                l.AddRange(CategoryIds(category.Subcategories));
+                if (category.Subcategories != null)
+                    l.AddRange(CategoryIds(category.Subcategories));
             }
             
             return l;