[Plugin: WP Facebook Timeline (MF Timeline)] Error on settings page

Thanks for this great Plugin! Looking forward to upcoming improvements.

I’m getting this error when I try to save the settings page. But even with the error it seemed to have saved the Twitter username.

Warning: Invalid argument supplied for foreach() in …/plugins/wp-facebook-timeline-mf-timeline/class-mf-timeline.php on line 156

Warning: Cannot modify header information – headers already sent by (output started at …/plugins/wp-facebook-timeline-mf-timeline/class-mf-timeline.php:156) in …/wp-includes/pluggable.php on line 934

Link: http://www.nicolasmesser.ch/timeline/

http://wordpress.org/extend/plugins/wp-facebook-timeline-mf-timeline/