Membership2 Invitation Codes error

First, I realize the Invitation Codes add-on is a beta...

I'm getting this error:
Warning: Invalid argument supplied for foreach() in /nas/wp/www/staging/trimergence/wp-content/plugins/membership/app/addon/invitation/helper/class-ms-addon-invitation-helper-listtable.php on line 121

When I try to change the memberships to which the code applies, it always resets back to "Any".

Thanks,
Scott