How to get chat of not accepted contact?

[mihalt]

I've just noticed, that if a new not accepted contact chat me something I have SkypeNewMessageEvent, but there is error when I try to get event.msg.chat like skpy.core.SkypeApiException: ('404 response from GET https://azwus1-client-s.gateway.messenger.live.com/v1/users/ME/conversations/8:someuser', <Response [404]>) I have a few places in my app, that are demanded from chat object of message. Can you give any recommendations how to prevent the problem like this or how to handle exception? I would like to not accept new contacts by default.