diff --git a/src/OpenDirectoryDownloader/DirectoryParser.cs b/src/OpenDirectoryDownloader/DirectoryParser.cs
index 03a18c35..35e47d7a 100644
--- a/src/OpenDirectoryDownloader/DirectoryParser.cs
+++ b/src/OpenDirectoryDownloader/DirectoryParser.cs
@@ -165,7 +165,7 @@ public static async Task<WebDirectory> ParseHtml(WebDirectory webDirectory, stri
 				}
 			}
 
-			if (OpenDirectoryIndexer.Session.Parameters.ContainsKey(Constants.GoogleDriveIndexType))
+			if (OpenDirectoryIndexer.Session is not null && OpenDirectoryIndexer.Session.Parameters.ContainsKey(Constants.GoogleDriveIndexType))
 			{
 				string googleDriveIndexType = OpenDirectoryIndexer.Session.Parameters[Constants.GoogleDriveIndexType];