1 files changed, 5 insertions, 0 deletions
diff --git a/Emby.Server.Implementations/Images/BaseDynamicImageProvider.cs b/Emby.Server.Implementations/Images/BaseDynamicImageProvider.cs
index 5a8be5a49..7a36691df 100644
--- a/Emby.Server.Implementations/Images/BaseDynamicImageProvider.cs
+++ b/Emby.Server.Implementations/Images/BaseDynamicImageProvider.cs
@@ -149,6 +149,11 @@ namespace Emby.Server.Implementations.Images
 
             var mimeType = MimeTypes.GetMimeType(outputPath);
 
+            if (string.Equals(mimeType, "application/octet-stream", StringComparison.OrdinalIgnoreCase))
+            {
+                mimeType = "image/png";
+            }
+
             await ProviderManager.SaveImage(item, outputPath, mimeType, imageType, null, false, cancellationToken).ConfigureAwait(false);
 
             return ItemUpdateType.ImageUpdate;