title: How to fix: "TypeError: 'null' is not an object (evaluating '$('div.comment').getLast')"
body: <p>Please who knows how fix this error? I'm trying to send my comment to the site server and get this error (I'm using mootools,framework: moobilejs)<br>
  mine javascript code here <a href="https://www.evernote.com/shard/s448/sh/a1d1bdd9-24be-430c-a06d-5c8c0bf8952b/8b89d559e705c2d2df17f57f5fb498eb" rel="nofollow">https://www.evernote.com/shard/s448/sh/a1d1bdd9-24be-430c-a06d-5c8c0bf8952b/8b89d559e705c2d2df17f57f5fb498eb</a>
  my html code
  `</p>
  
  <pre><code>&lt;div data-role="navigation-bar" class="center"&gt;
      &lt;div data-role="button" data-name="back-button" data-style="back" class="bar-left"&gt;
          &lt;div class="in_comment"&gt;&lt;/div&gt;
      &lt;/div&gt;
      &lt;div data-role="title" class="bar-center"&gt;Коментарии&lt;/div&gt;
      &lt;div data-role="button" class="bar-right"&gt; 
          &lt;div class="best"&gt;&lt;/div&gt;
      &lt;/div&gt;
  &lt;/div&gt;
  &lt;div data-role="content"&gt;
      &lt;div class="activity-text" id="loader1"&gt;Загрузка&lt;/div&gt;
      &lt;div id="loader2" data-role="activity-indicator" data-name="activity-indicator" class="activity-indicator active"&gt;&lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>`</p>