Custom Menu Classes

I’m trying to add a custom class to the menus that are generated. I am adding a custom field to each page/post and I need the value to be in the class. Here is my code.

add_filter('nav_menu_css_class' , 'special_nav_class' , 10 , 2);
	function special_nav_class($classes, $item){
		$color = get_post_custom($item->object_id, 'color', TRUE);
		echo "[".$item->object_id."][".$color."]";
		if($color == "green"){
			$classes[] = 'green';
		}else if($color == "yellow"){
			$classes[] = 'yellow';
		}else{
			$classes[] = 'pink';
		}
		return $classes;
	}

The part the does the echo is spitting out the correct ID but the $color is always an array. I can’t figure out what is going wrong.