From d0f1edf245b84f103db46facafc09bc43e086b3f Mon Sep 17 00:00:00 2001
From: Arsen Melikyan <bugron@mail.ru>
Date: Sat, 16 Jan 2016 22:31:42 +0400
Subject: [PATCH] Fix incorrect auto-scrolling logic

---
 client/main.js | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/client/main.js b/client/main.js
index 9b08476590..a81e14578f 100644
--- a/client/main.js
+++ b/client/main.js
@@ -267,9 +267,11 @@ $(document).ready(function() {
     var lastChallenge = $('.sr-only').filter(function() {
       return $(this).text() === ' Complete';
     });
-    lastChallenge = lastChallenge[lastChallenge.length - 1];
-    var scrollTo = $(lastChallenge).offset().top - 250;
-    $('html, body').scrollTop(scrollTo);
+    if (lastChallenge.length) {
+      lastChallenge = lastChallenge[lastChallenge.length - 1];
+      var scrollTo = $(lastChallenge).offset().top - 250;
+      $('html, body').scrollTop(scrollTo);
+    }
   }
 
   // map