To solve this problem add the following piece of JavaScript code to your page, add this between <script> elements and do not put it in a function:

  if (typeof Array.indexOf != 'function') {
      Array.prototype.indexOf = function(f, s) {
          if (typeof s == 'undefined') {
            s = 0;
          }

          for (var _index = s; _index < this.length; _index++) {
              if (f === this[_index]) return _index;
          }

          return -1;
      }
  }