Stripe webhook card decline error blows up instead of not blowing up

[lilliealbert]

We're getting the following error when a webhook with a declined card comes in:

     # `undefined method 'card' for #<Stripe::Charge:0x007fab606884c8>`
     # app/helpers/stripe_event_helper.rb:17

     if event.data.object.customer.present?
        email = User.find_by_stripe_customer_id(event.data.object.customer).email
      else
        email = event.data.object.card.name
      end
      DuesMailer.failed(email).deliver_now
    end

The full stacktrace / details are in Bugsnag — hit up the #du-app channel on Slack if you can help fix this and need access to the exception itself.