Activating Hustle causes catchable error

Howdy! I've been trying to setup a sweet email capture form using hustle, but it breaks my site. Here's the message I'm getting when loading the front end:

Catchable fatal error: Argument 1 passed to Opt_In_Meta::__construct() must be of the type array, null given, called in /home/content/07/9970107/html/indelible/wp-content/plugins/hustle/inc/meta/opt-in-meta-design.php on line 43 and defined in /home/content/07/9970107/html/indelible/wp-content/plugins/hustle/inc/opt-in-meta.php on line 8

I've activated support on the site, so let me know if you need any other info. Thanks!