[Plugin: Group Documents] Warning: division by zero (?)

Just installed on WP 3.1.1.: on the document page I get this message. Haven´t tried uploading yet..

Warning: Division by zero in /home/mienreda/public_html/wp-content/plugins/buddypress-group-documents/include/templatetags.php on line 257

http://wordpress.org/extend/plugins/buddypress-group-documents/