Errors when performing tasks with Membership 2

I'm getting errors when trying to perform certain tasks when Membership 2 active:
Delete User
Fatal error: Using $this when not in object context in /nas/content/staging/videobiker/wp-content/plugins/membership/app/addon/mailchimp/class-ms-addon-mailchimp.php on line 439
Add Membership to Existing User
Fatal error: Using $this when not in object context in /nas/content/staging/videobiker/wp-content/plugins/membership/app/addon/mailchimp/class-ms-addon-mailchimp.php on line 439
Trying to add new user via M2
Fatal error: Using $this when not in object context in /nas/content/staging/videobiker/wp-content/plugins/membership/app/addon/mailchimp/class-ms-addon-mailchimp.php on line 439

This happens with version 1.1 and 1.1.1, did a downgrade to 1.0.3.5 and it worked.

Thanks in advance!