Nagios Plugin issue

I’ve deployed Nagios Plugin, when I run ./check-services.php manualy , the fping service becomes green for 20 seconds, and then moves to blue state, looks like cron isn’t working
This what I added in cron
*/1 * * * * librenms /opt/librenms/check-services.php >> /dev/null 2>&1

Please advise

can you post your whole crontab?

What operating system are you using?

solved it, it was permission issue on check_fping file