[Plugin: StatPressCN] Division by zero

After installing the latest version of your plugin, every time I visits into the StatPressCN Overview page, I will have these PHP errors:-

Warning: Division by zero in /<absolute-path-to-wordpress-folder>/wp-content/plugins/statpresscn/statpresscn.php on line 873

Warning: Division by zero in /<absolute-path-to-wordpress-folder>/wp-content/plugins/statpresscn/statpresscn.php on line 957

Warning: Division by zero in /<absolute-path-to-wordpress-folder>/wp-content/plugins/statpresscn/statpresscn.php on line 1040

Warning: Division by zero in /<absolute-path-to-wordpress-folder>/wp-content/plugins/statpresscn/statpresscn.php on line 1122

The plugin seems to work just fine though. Therefore how to get rid of that errors above?

http://wordpress.org/extend/plugins/statpresscn/