Spark Client - Window Close Error

When you start a conversation with someone, then close the window. It causes the following generic error: “Unable to add contact”.

No error logs on the client, and no messages seen in the debug or the error log.

Has anyone seen this?

I can reproduce it everytime I chat with someone. Is there a way to troubleshoot this? Does this have something to do with my LDAP to AD authentication?

An Update:

It seems to only happen during the same session as you talk to or add a new person to your online friends list. Once you close the client and allow it to exit completely. The error will not happen again when you reproduce the steps.

-Israel