When a operator connects to a chat session, the following error popup on the client side :

 

http://livechat.conceptdata.dk/cutesoft_client/cutechat/supportClient.js,661
'undefined' is null or not an object

window_error

SUI_HandleChatEvent

_InvokeChatEvent

_Sync_HandleSTCMessage

_Sync_Handleresponse

_Sync_Return

ChatService_ParseResponse
anonymous function

 

What is wrong ?