I get an error on the default registration page

This is a clean install nad only wpmu dev installed with membership2.

When loading the default registration page, I get the following error just after the "Register My Account" button:

Warning: Invalid argument supplied for foreach() in ......../wp-content/plugins/membership/app/addon/profilefields/class-ms-addon-profilefields.php on line 503

Note: I took out my site info from the begging of the message (before the wp-content).