Hi PeterPed,
Please try the way below, it will fix this error
open "\CuteSoft_Client\CuteChat\SupportClient.js", add the code below into the top of this page
var span_pos=document.getElementById("span_pos");
var input_url=document.getElementById("input_url");
var input_referrer=document.getElementById("input_referrer");
var span_waiting=document.getElementById("span_waiting");
var span_nextline=document.getElementById("span_nextline");
Regards,
Ken