Hustle PHP Fatal error:

Hustle isn't working anymore and seeing this error in the Error Log:

[18-Dec-2016 18:41:15 UTC] PHP Fatal error: Uncaught Error: Cannot re-assign $this in /home/parentin/public_html/wp-content/plugins/hustle/opt-in.php:245
Stack trace:
#0 /home/parentin/public_html/wp-content/plugins/hustle/opt-in.php(245): extract(Array, 0)
#1 /home/parentin/public_html/wp-content/plugins/hustle/inc/opt-in-front.php(208): Opt_In->render('general/layouts...')
#2 /home/parentin/public_html/wp-includes/class-wp-hook.php(298): Opt_In_Front->add_layout_templates('')
#3 /home/parentin/public_html/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(NULL, Array)
#4 /home/parentin/public_html/wp-includes/plugin.php(453): WP_Hook->do_action(Array)
#5 /home/parentin/public_html/wp-includes/general-template.php(2590): do_action('wp_footer')
#6 /home/parentin/public_html/wp-content/themes/hueman/footer.php(128): wp_footer()
#7 /home/parentin/public_html/wp-includes/template.php(684): require_once('/home/parentin/...')
#8 /home/parentin/public_html/wp-includes/template.php(643): load_template('/home/parentin/...', true)
#9 /home/parentin/publ in /home/parentin/public_html/wp-content/plugins/hustle/opt-in.php on line 245