Shortcode Throwing JS error

I’m getting this error when adding a form via shortcode to a page:

Uncaught TypeError: Cannot set property ‘nodeValue’ of undefined

Culprit is:

$("div.ss-radio label:last+span.ss-q-other-container").prev().contents().filter(function() {
     return this.nodeType == 3;
})[0].nodeValue = "Other:";

I don’t want to alter plugin code files, any idea on how to fix the error?

http://ww.wp.xz.cn/extend/plugins/wpgform/