2 files changed, 13 insertions, 25 deletions
diff --git a/MediaBrowser.Providers/Plugins/TheTvdb/TvdbClientManager.cs b/MediaBrowser.Providers/Plugins/TheTvdb/TvdbClientManager.cs
index cd2f96f14..f22d484ab 100644
--- a/MediaBrowser.Providers/Plugins/TheTvdb/TvdbClientManager.cs
+++ b/MediaBrowser.Providers/Plugins/TheTvdb/TvdbClientManager.cs
@@ -2,6 +2,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Globalization;
 using System.Linq;
 using System.Reflection;
 using System.Runtime.CompilerServices;
@@ -19,7 +20,6 @@ namespace MediaBrowser.Providers.Plugins.TheTvdb
     {
         private const string DefaultLanguage = "en";
 
-        private readonly SemaphoreSlim _cacheWriteLock = new SemaphoreSlim(1, 1);
         private readonly IMemoryCache _cache;
         private readonly TvDbClient _tvDbClient;
         private DateTime _tokenCreatedAt;
@@ -176,7 +176,7 @@ namespace MediaBrowser.Providers.Plugins.TheTvdb
             string language,
             CancellationToken cancellationToken)
         {
-            searchInfo.SeriesProviderIds.TryGetValue(MetadataProvider.Tvdb.ToString(),
+            searchInfo.SeriesProviderIds.TryGetValue(nameof(MetadataProvider.Tvdb),
                 out var seriesTvdbId);
 
             var episodeQuery = new EpisodeQuery();
@@ -203,10 +203,10 @@ namespace MediaBrowser.Providers.Plugins.TheTvdb
             else if (searchInfo.PremiereDate.HasValue)
             {
                 // tvdb expects yyyy-mm-dd format
-                episodeQuery.FirstAired = searchInfo.PremiereDate.Value.ToString("yyyy-MM-dd");
+                episodeQuery.FirstAired = searchInfo.PremiereDate.Value.ToString("yyyy-MM-dd", CultureInfo.InvariantCulture);
             }
 
-            return GetEpisodeTvdbId(Convert.ToInt32(seriesTvdbId), episodeQuery, language, cancellationToken);
+            return GetEpisodeTvdbId(Convert.ToInt32(seriesTvdbId, CultureInfo.InvariantCulture), episodeQuery, language, cancellationToken);
         }
 
         public async Task<string> GetEpisodeTvdbId(
@@ -218,7 +218,7 @@ namespace MediaBrowser.Providers.Plugins.TheTvdb
             var episodePage =
                 await GetEpisodesPageAsync(Convert.ToInt32(seriesTvdbId), episodeQuery, language, cancellationToken)
                     .ConfigureAwait(false);
-            return episodePage.Data.FirstOrDefault()?.Id.ToString();
+            return episodePage.Data.FirstOrDefault()?.Id.ToString(CultureInfo.InvariantCulture);
         }
 
         public Task<TvDbResponse<EpisodeRecord[]>> GetEpisodesPageAsync(
@@ -276,23 +276,10 @@ namespace MediaBrowser.Providers.Plugins.TheTvdb
                 return cachedValue;
             }
 
-            await _cacheWriteLock.WaitAsync().ConfigureAwait(false);
-            try
-            {
-                if (_cache.TryGetValue(key, out cachedValue))
-                {
-                    return cachedValue;
-                }
-
-                _tvDbClient.AcceptedLanguage = TvdbUtils.NormalizeLanguage(language) ?? DefaultLanguage;
-                var result = await resultFactory.Invoke().ConfigureAwait(false);
-                _cache.Set(key, result, TimeSpan.FromHours(1));
-                return result;
-            }
-            finally
-            {
-                _cacheWriteLock.Release();
-            }
+            _tvDbClient.AcceptedLanguage = TvdbUtils.NormalizeLanguage(language) ?? DefaultLanguage;
+            var result = await resultFactory.Invoke().ConfigureAwait(false);
+            _cache.Set(key, result, TimeSpan.FromHours(1));
+            return result;
         }
 
         private static string GenerateKey(params object[] objects)
diff --git a/MediaBrowser.Providers/Plugins/TheTvdb/TvdbEpisodeImageProvider.cs b/MediaBrowser.Providers/Plugins/TheTvdb/TvdbEpisodeImageProvider.cs
index 4d38d38dc..4e7c0e5a6 100644
--- a/MediaBrowser.Providers/Plugins/TheTvdb/TvdbEpisodeImageProvider.cs
+++ b/MediaBrowser.Providers/Plugins/TheTvdb/TvdbEpisodeImageProvider.cs
@@ -3,6 +3,7 @@
 using System;
 using System.Collections.Generic;
 using System.Net.Http;
+using System.Globalization;
 using System.Threading;
 using System.Threading.Tasks;
 using MediaBrowser.Controller.Entities;
@@ -76,7 +77,7 @@ namespace MediaBrowser.Providers.Plugins.TheTvdb
 
                     var episodeResult =
                         await _tvdbClientManager
-                            .GetEpisodesAsync(Convert.ToInt32(episodeTvdbId), language, cancellationToken)
+                            .GetEpisodesAsync(Convert.ToInt32(episodeTvdbId, CultureInfo.InvariantCulture), language, cancellationToken)
                             .ConfigureAwait(false);
 
                     var image = GetImageInfo(episodeResult.Data);
@@ -103,8 +104,8 @@ namespace MediaBrowser.Providers.Plugins.TheTvdb
 
             return new RemoteImageInfo
             {
-                Width = Convert.ToInt32(episode.ThumbWidth),
-                Height = Convert.ToInt32(episode.ThumbHeight),
+                Width = Convert.ToInt32(episode.ThumbWidth, CultureInfo.InvariantCulture),
+                Height = Convert.ToInt32(episode.ThumbHeight, CultureInfo.InvariantCulture),
                 ProviderName = Name,
                 Url = TvdbUtils.BannerUrl + episode.Filename,
                 Type = ImageType.Primary