Errors while scanning F5 load balancer module

Hello

While scanning an F5 device with loadbalancer module we get unconsistent scanning results, sometimes the scan finishs after 18s, sometimes after 70s and sometimes it gets stuck.

When running “poller.php -h hostname -d” we see 100’s of the following lines:

Warning: Illegal offset type in /opt/librenms/LibreNMS/Component.php on line 166
Warning: Illegal offset type in /opt/librenms/LibreNMS/Component.php on line 163

./validate.php

====================================

Component Version
LibreNMS 1.55-35-ga0c2df6cd
DB Schema 2019_09_05_153524_create_notifications_attribs_index (141)
PHP 7.2.19-0ubuntu0.18.04.2
MySQL 10.1.41-MariaDB-0ubuntu0.18.04.1
RRDTool 1.7.0
SNMP NET-SNMP 5.7.3

====================================

[OK] Composer Version: 1.9.0
[OK] Dependencies up-to-date.
[OK] Database connection successful
[OK] Database schema correct

Does anyone have an idea what to do?