I'm running refinerycms-inquiries (3.0.1) and when I disable the spam detection and try and send an email through the contact form I get the following error

NoMethodError in Refinery::Inquiries::InquiriesController#create
undefined method `ham?' for #<Refinery::Inquiries::Inquiry:0x007ff2940f6de0>

If I remark out the following if statement in inquiries_controller and try again it sends the email fine.
if @inquiry.ham? || Inquiries.send_notifications_for_inquiries_marked_as_spam