NicMic on "[Plugin: Async JS and CSS] Error message ( line 213)"

Hi,
When using the plugin on my site I get the following error message :

Warning: Invalid argument supplied for foreach() in /homez/www/wp-content/plugins/async-js-and-css/asyncJSandCSS.php on line 213

If I view my site while not logged in (no error while in admin).

This site has very few scripts / css.

http://wordpress.org/plugins/async-js-and-css/