diff --git a/Source/GrasscutterTools/Forms/FormMain.cs b/Source/GrasscutterTools/Forms/FormMain.cs
index c721436..a1d4f05 100644
--- a/Source/GrasscutterTools/Forms/FormMain.cs
+++ b/Source/GrasscutterTools/Forms/FormMain.cs
@@ -966,7 +966,8 @@ namespace GrasscutterTools.Forms
 
         private void CopyCommand()
         {
-            Clipboard.SetText(TxtCommand.Text);
+            if (!string.IsNullOrEmpty(TxtCommand.Text))
+                Clipboard.SetText(TxtCommand.Text);
         }
 
         private void OnOpenCommandInvoke()