DB Error: Column 'class_name' cannot be null

Stack Trace:

File: /srv/openjournal/sitios/www.revcimeq.sld.cu/lib/pkp/classes/scheduledTask/ScheduledTaskDAO.inc.php line 86
Function: DAO->update("INSERT INTO scheduled_tasks (class_name, last_run) VALUES (...", Array(1))

File: /srv/openjournal/sitios/www.revcimeq.sld.cu/plugins/generic/acron/AcronPlugin.inc.php line 247
Function: ScheduledTaskDAO->updateLastRunTime(Null, 1635182070)

File: (unknown) line (unknown)
Function: AcronPlugin->shutdownFunction()