From efd9a63fadc6d9795e6b862205d7548c4c49342b Mon Sep 17 00:00:00 2001
From: zhangdoa <zhangandhang@gmail.com>
Date: Thu, 12 Oct 2023 00:49:29 +0200
Subject: [PATCH] Fix a crash caused by missing track files.

(cherry picked from commit f784ad1d5d1a604e490c9c73298d8ebb81cadd24)
---
 .../TrackImport/Specifications/AlbumUpgradeSpecification.cs     | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/NzbDrone.Core/MediaFiles/TrackImport/Specifications/AlbumUpgradeSpecification.cs b/src/NzbDrone.Core/MediaFiles/TrackImport/Specifications/AlbumUpgradeSpecification.cs
index f6deffbc9..7d5f1ff96 100644
--- a/src/NzbDrone.Core/MediaFiles/TrackImport/Specifications/AlbumUpgradeSpecification.cs
+++ b/src/NzbDrone.Core/MediaFiles/TrackImport/Specifications/AlbumUpgradeSpecification.cs
@@ -32,7 +32,7 @@ namespace NzbDrone.Core.MediaFiles.TrackImport.Specifications
                 _logger.Debug("Min quality of new files: {0}", newMinQuality);
 
                 // get minimum quality of existing release
-                var existingQualities = currentRelease.Tracks.Value.Where(x => x.TrackFileId != 0).Select(x => x.TrackFile.Value.Quality);
+                var existingQualities = currentRelease.Tracks.Value.Where(x => x.TrackFileId != 0 && x.TrackFile.Value != null).Select(x => x.TrackFile.Value.Quality);
                 if (existingQualities.Any())
                 {
                     var existingMinQuality = existingQualities.OrderBy(x => x, qualityComparer).First();