lightbox failure to open recurring event

Scheduler 7.2.8, macOS, Safari and Chrome

Programmatically showing lightbox for a recurring event fails.
example from your samples:
scheduler-7.2.8/samples/03_extensions/01_recurring_events.html
From console, try _scheduler.showLightbox(1);_
Fails with:
Uncaught TypeError: Cannot read properties of undefined (reading 'start_date')
    at C (recurring.js:646:38)