Custom Post Type Icon not working

Hi there,

I inject a custom post type using php:

$args = array(
			'labels'          => $labels,
			'supports'        => $supports,
			'public'          => true,
			'capability_type' => 'post',
			'rewrite'         => array( 'slug' => 'bier', ), // Permalinks format
			'menu_position'   => 30,
			'menu_icon'       => 'fa-beer',
		);

But it doesn’t display because it seems to translate to:

<img src=”http://fa-beer&#8221; alt=””>

Is this a known issue?

Thank you !

https://wordpress.org/plugins/font-awesome-4-menus/