In order to fix that, we need to remove them. Here is quick fix. Open file jquery.rating.js:

from (line 97):

// grouping:
var n = this.name;


to:

// grouping:
var real_name = this.name;
var n = real_name.replace(/[^A-Za-z0-9_\-]/g, '-'); // remove unwanted characters


from (line 108):

$.rating.groups[n].valueElem = $('
');


to:

$.rating.groups[n].valueElem = $('
');

I have reported this in the bugtracker and I hope it will be included in the next release.