When polling with either IPMI or unix-agent modules enabled, the polling run stops with this error:

Sensors: PHP Fatal error:  Call to undefined function check_valid_sensors() in /opt/observium/includes/polling/unix-agent.inc.php on line 174

I've updated to the latest non-stable release, and no change. I've also historically had this issue and cleared my /opt/observium directory and re-installed but no change.

Any ideas?

Happy to provide more info if needed. Many thanks

Olly