Notice bug

In file :
auto-post-thumbnail\includes\class-apt.php

line 513, publish_post function, it’s better to check for $post not being null before accessing it’s property. In face it’s producing PHP Notice :

public function publish_post( $post_id, $post = null, $update = true ) {
		global $wpdb;

		if ( $post->post_status === 'auto-draft' ) {
			return null;
		}

P.S : if ( $post->post_status === ‘auto-draft’ ) should be if ( $post != null && $post->post_status === ‘auto-draft’ )