[Plugin: Facebook Feed Grabber] Default Feed not saved

Hi,

the default feed in the option page is not saved when I hit save. Same if I try choosing a feed in the widget.
In database I get this:

a:14:{s:6:"app_id";s:15:"603204716379386";s:6:"secret";s:32:"eaa83c0bc0d469fa15371c170181d0d1";s:12:"default_feed";N;s:10:"show_title";i:1;s:10:"cache_feed";i:5;s:12:"cache_folder";s:44:"Path/to/folder";s:11:"num_entries";i:4;s:6:"locale";s:5:"en_US";s:9:"proxy_url";s:0:"";s:5:"limit";i:1;s:15:"show_thumbnails";i:1;s:11:"style_sheet";s:9:"style.css";s:14:"delete_options";i:0;s:7:"version";s:5:"0.8.2";}

Note the N after “default_feed”.

What should I do?

Thanks