HTML error in widget

Hello. I’m getting an invalid HTML error message with the widget embed on http://www.idahoednews.org. The opening container div has a close tag. Below is the HTML block from viewing source code:

<li id=”opinionstage_widget-2″ class=”widget opinionstage_widget”><div id=”container_3404671″/>
<script>
(function () {
var opst = document.createElement(‘script’);
var os_host = document.location.protocol == “https:” ? “https:” : “http:”;
opst.type = ‘text/javascript’;
opst.async = true;
opst.src = os_host + ‘//’ + ‘www.opinionstage.com/containers/3404671/embed.js’;
(document.getElementsByTagName(‘head’)[0] ||
document.getElementsByTagName(‘body’)[0]).appendChild(opst);
}());
</script>

https://wordpress.org/plugins/social-polls-by-opinionstage/