Code in child theme's functions.php not working for Customizr 3.3.12

Hi all!
Currently I have this snippet of code in my child theme’s functions.php file in order to allow me to manually select the skin color I would like to use for each page.

/*
* Code to select skin type
*/
add_filter(‘tc_get_option’, ‘my_skin’, 20, 2);
function my_skin($value, $option){
if ( $option != ‘tc_skin’ )
return $value;
global $post;
if ( isset($post) && $skin=get_post_meta($post->ID, ‘skin’, ‘true’)){
return $skin.’.css’;
}
return $value;
}

The problem right now is that this code does not seem to work with the latest version of Customizr. Does anybody know how I can make this work?

Thanks in advance,
Jenny