500 error with Profile

I’m running WP 3.6.1, and the latest version of this plugin (1.1). I can configure and enable the system, but when I try to add my Google Talk username to my profile (I checked the box enabling the Google Talk authentication method), the page shows a 500 error, and the settings aren’t saved.

http://ww.wp.xz.cn/plugins/im-login-dongle/