[Plugin: Wp CSS] invalid argument after upgrade

I have upgrade from 2.6.1 to 2.6.2 and now wp css plugin give me this error Warning: Invalid argument supplied for foreach() in /plugins/wp-css/wp-css-files-list.php on line 295

this is function that doesnt work `function wp_css_files_for_post()
{
global $post;

$array = get_post_meta($post->ID, ‘wp_css_file’);

if (count($array) > 0) {
$string = ”;
$string .= “<!– WP CSS –>\n”;

foreach ($array as $value) {
if (function_exists(‘wp_css’)) {
$string .= ‘<link rel=”stylesheet” href=”‘.wp_css($value, false).'” type=”text/css” media=”screen,projection” charset=”utf-8″ />’.”\n”;
} else {
$string .= ‘<link rel=”stylesheet” href=”‘.get_stylesheet_directory_uri().’/’.$value.'” type=”text/css” media=”screen,projection” charset=”utf-8″ />’.”\n”;
}

}

$string .= “<!– WP CSS closes –>\n”;
echo $string;
}
}`

Can anyone help me?
Thanks