Suspected bug within Membership 3.5 Beta 6.1

I have created a page for registered users to see their current subscription level and/or renew/upgrade their membership level using the admin interface for Membership plugin. (Membership->Options->Membership Pages->Subscriptions page)

When I go to view the created page I get the following error:

Fatal error: Can't use method return value in write context in .../membership/classes/Membership/Render/Page/Subscription/Renew.php on line 113

@Eugene Manuilov Do you have any ideas?

Thanks