diff --git a/src/Readarr.Http/Frontend/Mappers/StaticResourceMapperBase.cs b/src/Readarr.Http/Frontend/Mappers/StaticResourceMapperBase.cs
index a475412b6..500eb9c8a 100644
--- a/src/Readarr.Http/Frontend/Mappers/StaticResourceMapperBase.cs
+++ b/src/Readarr.Http/Frontend/Mappers/StaticResourceMapperBase.cs
@@ -49,7 +49,7 @@ namespace Readarr.Http.Frontend.Mappers
 
             _logger.Warn("File {0} not found", filePath);
 
-            return null;
+            return Task.FromResult<IActionResult>(null);
         }
 
         protected virtual Stream GetContentStream(string filePath)