Calendar widget Ajax is broken

Trying out plugin for first time and found the calendar widget ajax is broken.

They’re working on a fix which is due out today: https://www.dfactory.eu/support/topic/calendar-widget-admin-ajax/

My only concern is this bug looks like it has some history as an ongoing issue so a red flag regards putting it out there in production???

Hopefully this works out, as otherwise its a v.nice featured plugin and definitely more lightweight on the DB and page-loads than alternatives.

https://wordpress.org/plugins/events-maker/