Delete expired events

When I have the ‘Delete expired events’ ticked, old events are not being deleted and logs the following error each day:

[09-Apr-2019 14:50:12 UTC] PHP Fatal error: Uncaught Error: Call to a member function format() on boolean in /wp-content/plugins/event-organiser/includes/event-organiser-register.php:502
Stack trace:
#0 /wp-includes/class-wp-hook.php(286): eventorganiser_delete_expired_events()
#1 /wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(”, Array)
#2 /wp-includes/plugin.php(531): WP_Hook->do_action(Array)
#3 /wp-cron.php(133): do_action_ref_array(‘eventorganiser_…’, Array)
#4 {main}
thrown in /wp-content/plugins/event-organiser/includes/event-organiser-register.php on line 502

PHP 7.2 / Event organiser 3.7.6