click_blocker class is added too many times

``` html
<li class="menu_bar_content">
    <div class="menu_bar_item disabled">
       <a rel="nofollow" href="/interests/tsl_areas/44/evolve" data-method="post">Evolve Record</a>
    </div>
    <div class="click_blocker click_blocker click_blocker click_blocker"></div>
</li>
```
