diff --git a/src/OpenDirectoryDownloader/OpenDirectoryIndexer.cs b/src/OpenDirectoryDownloader/OpenDirectoryIndexer.cs
index 0cc40278..2c7f8cad 100644
--- a/src/OpenDirectoryDownloader/OpenDirectoryIndexer.cs
+++ b/src/OpenDirectoryDownloader/OpenDirectoryIndexer.cs
@@ -1244,7 +1244,7 @@ private async Task ProcessWebDirectoryAsync(string threadName, WebDirectory webD
 
 		if (httpResponseMessage is null)
 		{
-			throw new Exception($"Error retrieving directory listing for {webDirectory.Url}");
+			throw new Exception($"Error retrieving directory listing (empty/null) for {webDirectory.Url}");
 		}
 
 		if (!HttpClient.DefaultRequestHeaders.Contains("Referer"))