Avoid Spark login failure warning at startup when connection to server is not available

Every time I switch on my laptop in offline mode (when internet conenction to openfire server is not available) I get a warning from Spark that it is not able to login automatically because obviously it cannot contact openfire server. Spark window pops up and I have to close it manually, this is very noising.

Is there a way to stop this warning and keeping Spark in auto start and auto login mode simply running on the system tray? MSN Messenger for example works in this way. If it doesn’t find the server it automatically put itself in offline mode on the system tray without any warning.

Thanks

Davide