Deprecated Global Variable in e-Newsletter

We're receiving the following errors when performing actions with newsletters (delete, edit, send):

Notice: Trying to get property of non-object in /home/etftrade/public_html/ww2/wp-content/plugins/e-newsletter/email-newsletter-files/builder/class.builder.php on line 21

Notice: Trying to get property of non-object in /home/etftrade/public_html/ww2/wp-content/plugins/e-newsletter/email-newsletter-files/builder/class.builder.php on line 22

I believe that the $current_user object has been deprecated since WP 4.5