I just checked the `stripe_event` source and it looks like they've updated it to have the check in there. Because it is being called twice, I believe it is common for it to error out. [source](https://github.com/integrallis/stripe_event/blob/master/app/controllers/stripe_event/webhook_controller.rb) Try commenting out the `routes.rb` line for the controller and add `mount StripeEvent::Engine, at: '/stripe/event'`