Superfluous (or wrong) JS code

I found a strange javascript bug on my Ubercart checkout page. I don't know why this bug was appeared just on this page (and why I can't reproduce it in Firefox), but it was provided exactly by DHTML Menu js code.

Here is Chrome console output:

Uncaught Syntax error, unrecognized expression: )

I had debugged this exception, and found the reason. If someone interested for more information, I will provide it.

Here is the code which provide bug:

  // Get cookie
  if (!effects.siblings) {
    var cookie = Drupal.dhtmlMenu.cookieGet();
    for (var i in cookie) {
      // If the cookie was not applied to the HTML code yet, do so now.
      var li = $('#dhtml_menu-' + cookie[i]).parents('li:first');
      if ($(li).hasClass('collapsed')) {
        Drupal.dhtmlMenu.toggleMenu(li);
      }
    }
  }

During debugging I found that this code do nothing at all.
For example, if I had two menu items expanded, cookieGet() returns "_menu-31605,_menu-31603". This is string value, and "for" cycle executes for each character.

May be this code works wrong, but DHTML Menu works fine without it. So, I suggest to remove mentioned code.