Link IP’s has stopped working?

Howdy,

This function has stopped working for some reason. Any thoughts?

https://wordpress.org/support/topic/link-ips-in-users-column-to-specific-ip-check-site/

function filter_ripm_show_ip($theip) {
	$theip = '<a href="https://duckduckgo.com/?q='.$theip.'">'.$theip.'</a>';
	return $theip;
}
add_filter('ripm_show_ip', 'filter_ripm_show_ip');