Huge bug when trying to make Events + work with Membership 2

I'm trying to setup a Meetup like site using Events +, Membership 2 and BuddyPress.
(https://premium.wpmudev.org/blog/building-meetup-events-membership-2/)

I could setup the membership registration to work with buddypress, and it works great.

The problems start as soon as I activate the Events + plugin:
When I try to replicate the subscription process, when I click on "complete signup" button, I'm getting a blank page instead of being redirected properly to the payment or confirmation page. I activated the debug function, and here is what I get...

Notice: Undefined index: post_type in /home/parisforher/public_html/parisforher/wp-content/plugins/events-and-bookings/events-and-bookings.php on line 153

Please help, I really need the events plugin to work in combination with membership 2.
Thanks a lot