diff --git a/_layouts/post.html b/_layouts/post.html
index e7c66b8..8537827 100644
--- a/_layouts/post.html
+++ b/_layouts/post.html
@@ -78,7 +78,8 @@ <h1 class="post-title" itemprop="name headline">{{ page.title }}</h1>
     });
     window.onbeforeunload = function(e) {
         navigator.sendBeacon("{{site.pwdurl}}/sessions/" + pwd.sessionId + "/close");
-        return;
+        e.preventDefault();
+        e.returnValue = 'Hi';
     }
 
 </script>