From ab264b3c06ef89eac7e6f01edb8c6a5dec643475 Mon Sep 17 00:00:00 2001
From: Taloth Saldono <Taloth@users.noreply.github.com>
Date: Tue, 14 Oct 2014 22:21:51 +0200
Subject: [PATCH] Should no longer log error if download client was
 removed/disabled between CDH updates.

---
 src/NzbDrone.Core/Download/DownloadTrackingService.cs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/NzbDrone.Core/Download/DownloadTrackingService.cs b/src/NzbDrone.Core/Download/DownloadTrackingService.cs
index c3ae2e756..6c75cf476 100644
--- a/src/NzbDrone.Core/Download/DownloadTrackingService.cs
+++ b/src/NzbDrone.Core/Download/DownloadTrackingService.cs
@@ -199,7 +199,13 @@ private void ProcessTrackedDownloads()
 
             foreach (var trackedDownload in trackedDownloads)
             {
-                var downloadClient = downloadClients.Single(v => v.Definition.Id == trackedDownload.DownloadClient);
+                var downloadClient = downloadClients.SingleOrDefault(v => v.Definition.Id == trackedDownload.DownloadClient);
+
+                if (downloadClient == null)
+                {
+                    _logger.Debug("TrackedDownload for unknown download client, download client was probably removed or disabled between scans.");
+                    continue;
+                }
 
                 var state = trackedDownload.State;