3 files changed, 20 insertions, 13 deletions
diff --git a/MediaBrowser.Api/UserLibrary/ItemsService.cs b/MediaBrowser.Api/UserLibrary/ItemsService.cs
index f842230ee3..b4a3026480 100644
--- a/MediaBrowser.Api/UserLibrary/ItemsService.cs
+++ b/MediaBrowser.Api/UserLibrary/ItemsService.cs
@@ -99,7 +99,7 @@ namespace MediaBrowser.Api.UserLibrary
             {
                 ancestorIds = _libraryManager.GetUserRootFolder().GetChildren(user, true)
                     .Where(i => i is Folder)
-                    .Where(i => !excludeFolderIds.Contains(i.Id.ToString("N")))
+                    .Where(i => !excludeFolderIds.Contains(i.Id.ToString("N", CultureInfo.InvariantCulture)))
                     .Select(i => i.Id)
                     .ToArray();
             }
@@ -175,11 +175,6 @@ namespace MediaBrowser.Api.UserLibrary
 
             var dtoList = _dtoService.GetBaseItemDtos(result.Items, dtoOptions, user);
 
-            if (dtoList == null)
-            {
-                throw new InvalidOperationException("GetBaseItemDtos returned null");
-            }
-
             return new QueryResult<BaseItemDto>
             {
                 TotalRecordCount = result.TotalRecordCount,
@@ -228,7 +223,9 @@ namespace MediaBrowser.Api.UserLibrary
             var collectionFolders = _libraryManager.GetCollectionFolders(item);
             foreach (var collectionFolder in collectionFolders)
             {
-                if (user.Policy.EnabledFolders.Contains(collectionFolder.Id.ToString("N"), StringComparer.OrdinalIgnoreCase))
+                if (user.Policy.EnabledFolders.Contains(
+                    collectionFolder.Id.ToString("N", CultureInfo.InvariantCulture),
+                    StringComparer.OrdinalIgnoreCase))
                 {
                     isInEnabledFolder = true;
                 }
@@ -458,9 +455,7 @@ namespace MediaBrowser.Api.UserLibrary
                         IncludeItemTypes = new[] { typeof(MusicAlbum).Name },
                         Name = i,
                         Limit = 1
-
-                    }).Select(albumId => albumId);
-
+                    });
                 }).ToArray();
             }
 
diff --git a/MediaBrowser.Api/UserLibrary/UserLibraryService.cs b/MediaBrowser.Api/UserLibrary/UserLibraryService.cs
index a9b06095da..45694a6780 100644
--- a/MediaBrowser.Api/UserLibrary/UserLibraryService.cs
+++ b/MediaBrowser.Api/UserLibrary/UserLibraryService.cs
@@ -2,6 +2,7 @@ using System;
 using System.Linq;
 using System.Threading;
 using System.Threading.Tasks;
+using MediaBrowser.Common.Extensions;
 using MediaBrowser.Controller.Dto;
 using MediaBrowser.Controller.Entities;
 using MediaBrowser.Controller.Entities.Audio;
@@ -366,11 +367,21 @@ namespace MediaBrowser.Api.UserLibrary
 
             var dtoOptions = GetDtoOptions(_authContext, request);
 
-            var dtos = item.GetExtras(new[] { ExtraType.Trailer })
+            var dtosExtras = item.GetExtras(new[] { ExtraType.Trailer })
                 .Select(i => _dtoService.GetBaseItemDto(i, dtoOptions, user, item))
                 .ToArray();
 
-            return ToOptimizedResult(dtos);
+            if (item is IHasTrailers hasTrailers)
+            {
+                var trailers = hasTrailers.GetTrailers();
+                var dtosTrailers = _dtoService.GetBaseItemDtos(trailers, dtoOptions, user, item);
+                var allTrailers = new BaseItemDto[dtosExtras.Length + dtosTrailers.Count];
+                dtosExtras.CopyTo(allTrailers, 0);
+                dtosTrailers.CopyTo(allTrailers, dtosExtras.Length);
+                return ToOptimizedResult(allTrailers);
+            }
+
+            return ToOptimizedResult(dtosExtras);
         }
 
         /// <summary>
diff --git a/MediaBrowser.Api/UserLibrary/UserViewsService.cs b/MediaBrowser.Api/UserLibrary/UserViewsService.cs
index 1d61c5c1e8..2fa5d8933c 100644
--- a/MediaBrowser.Api/UserLibrary/UserViewsService.cs
+++ b/MediaBrowser.Api/UserLibrary/UserViewsService.cs
@@ -1,4 +1,5 @@
 using System;
+using System.Globalization;
 using System.Linq;
 using MediaBrowser.Controller.Dto;
 using MediaBrowser.Controller.Entities;
@@ -116,7 +117,7 @@ namespace MediaBrowser.Api.UserLibrary
                 .Select(i => new SpecialViewOption
                 {
                     Name = i.Name,
-                    Id = i.Id.ToString("N")
+                    Id = i.Id.ToString("N", CultureInfo.InvariantCulture)
 
                 })
             .OrderBy(i => i.Name)