diff --git a/Tesses.YouTubeDownloader/src/YouTubeDownloader.tcross b/Tesses.YouTubeDownloader/src/YouTubeDownloader.tcross
index 2b0ffb3..c5fd327 100644
--- a/Tesses.YouTubeDownloader/src/YouTubeDownloader.tcross
+++ b/Tesses.YouTubeDownloader/src/YouTubeDownloader.tcross
@@ -812,7 +812,7 @@ class TYTD.Downloader {
 			env.LoadFileWithDependencies(subdir, _exec);
 
 			_pkg.pluginObject = d.PluginInit();
-			if(_pkg.pluginObject.Server != null && _pkg.pluginObject.Server != undefined)
+			if(TypeIsDefined(_pkg.pluginObject.Server))
 			{
 				var path = /"plugin"/_pkg.pluginName;