$(form).after(data.form).next().attr("action", action).uc_aac_attach().uc_ucoi_attach is not a function

Hey guys, firebug told me, an error:

$(form).after(data.form).next().attr("action", action).uc_aac_attach().uc_ucoi_attach is not a function

I saw the code:

      if (data.form) {
        var action = form.attr('action');
        if (UCOI) {
--->        	$(form).after(data.form).next().attr('action', action).uc_aac_attach().uc_ucoi_attach();
        } else {
        	$(form).after(data.form).next().attr('action', action).uc_aac_attach();
        }
        form.remove();
      }

What to do now? – It's critical bug because I've two "add to cart" forms on the node. An when I'm selecting a option, I got another "add to cart" form.

Please help.

Yannick