After update DB scheme with ./discovery.php -u data don't collect in mysql and rrd.
Before update, log:
[2018/11/22 14:27:38 +0300] poller-wrapper.py(1161): /opt/observium/poller-wrapper.py: processed 262 devices in 456.47 seconds with 18 threads, load average (5min) 3.96
And now:
[2018/11/22 16:35:02 +0300] poller-wrapper.py(18750): /opt/observium/poller-wrapper.py: processed 0 devices in 0.56 seconds with 18 threads, load average (5min) 0.21

Service mysql have status active and have database observium.

/opt/observium$ ./check-errors.php
PHP Fatal error: Uncaught Error: Call to undefined function generate_device_link() in /opt/observium/check-errors.php:36
Stack trace:
#0

thrown in /opt/observium/check-errors.php on line 36

Please help in solving this problem. The work of the system is critical for us.