catch disposed error in chapter task

MediaBrowser.Server.Implementations/ScheduledTasks/ChapterImagesTask.cs

@@ -119,33 +119,40 @@ namespace MediaBrowser.Server.Implementations.ScheduledTasks
 
                 var extract = !previouslyFailedImages.Contains(key, StringComparer.OrdinalIgnoreCase);
 
-                var chapters = _itemRepo.GetChapters(video.Id).ToList();
+                try
-
-                var success = await _encodingManager.RefreshChapterImages(new ChapterImageRefreshOptions
                 {
-                    SaveChapters = true,
+                    var chapters = _itemRepo.GetChapters(video.Id).ToList();
-                    ExtractImages = extract,
-                    Video = video,
-                    Chapters = chapters
 
-                }, CancellationToken.None);
+                    var success = await _encodingManager.RefreshChapterImages(new ChapterImageRefreshOptions
+                    {
+                        SaveChapters = true,
+                        ExtractImages = extract,
+                        Video = video,
+                        Chapters = chapters
 
-                if (!success)
+                    }, CancellationToken.None);
-                {
-                    previouslyFailedImages.Add(key);
 
-                    var parentPath = Path.GetDirectoryName(failHistoryPath);
+                    if (!success)
+                    {
+                        previouslyFailedImages.Add(key);
 
-					_fileSystem.CreateDirectory(parentPath);
+                        var parentPath = Path.GetDirectoryName(failHistoryPath);
 
-					_fileSystem.WriteAllText(failHistoryPath, string.Join("|", previouslyFailedImages.ToArray()));
+                        _fileSystem.CreateDirectory(parentPath);
-                }
 
-                numComplete++;
+                        _fileSystem.WriteAllText(failHistoryPath, string.Join("|", previouslyFailedImages.ToArray()));
-                double percent = numComplete;
+                    }
-                percent /= videos.Count;
+
+                    numComplete++;
+                    double percent = numComplete;
+                    percent /= videos.Count;
 
-                progress.Report(100 * percent);
+                    progress.Report(100 * percent);
+                }
+                catch (ObjectDisposedException)
+                {
+                    break;
+                }
             }
         }