PHP Notice in WP Admin

Getting the following PHP notice on some pages of WordPress admin (Tools, Plugins):

Notice: Trying to get property of non-object in /var/www/html/wp-content/plugins/smart-logo-showcase-lite/smart-logo-showcase-lite.php on line 344

This can be fixed by check that the global $post is truthy.

function smls_admin_footer_text( $text ){
            global $post;
            if ( ! $post ) {
            	return $text;
            }
            if ( 'smartlogo' == $post -> post_type ) {
                $link = 'https://ww.wp.xz.cn/support/plugin/smart-logo-showcase-lite/reviews/#new-post';
                $pro_link = 'https://codecanyon.net/item/smart-logo-showcase-responsive-clients-logo-gallery-plugin-for-wordpress/19274075?ref=AccessKeys';
                $text = 'Enjoyed Smart Logo Showcase Lite? <a href="' . $link . '" target="_blank">Please leave us a ★★★★★ rating</a> We really appreciate your support! | Try premium version of <a href="' . $pro_link . '" target="_blank">Smart Logo Showcase</a> - more features, more power!';
                return $text;
            } else {
                return $text;
            }
        }