diff --git a/_includes/topbar.html b/_includes/topbar.html
index 12b290c..3e3761b 100644
--- a/_includes/topbar.html
+++ b/_includes/topbar.html
@@ -6,7 +6,7 @@
 
 <script>
     function closeWindow() {
-        window.open('','_self').close();
+        var newWindow = window.open('about:blank', '_self');
+        window.close();
     }
 </script>
-