I’m seeing the following fatal error in our PHP logs:
PHP Fatal error: Call to undefined method WP_Error::getNextDate() in /var/www/wp-content/plugins/events-calendar-pro/src/Tribe/Recurrence.php on line 119
In Tribe__Events__Pro__Recurrence, getNextDate includes the following:
$next_date = $this->series_rules->getNextDate( $current_date );
It’s possible via Tribe__Events__Pro__Recurrence__Series_Rules_Factory, build_rule_for_type() that $this->series_rules is actually a WP_Error instance, which would cause this fatal error.
I’m not sure what caused the issue or how to reproduce it, but the chain of events appears valid.