Subscribe by Email Can't export CSV

Subscribe by Email Can't export CSV - I get this error on the CSV when I try to do an export of the users.

<b>Fatal error</b>: Call to a member function get_subscription_email() on a non-object in <b>/home/makeadul/public_html/wp-content/plugins/subscribe-by-email/inc/helpers/general-helpers.php</b> on line <b>213</b>