find_or_create_customer throws error when customer does not exist

# app/lib/payment_gateways/stripe_crypt.rb:47
def find_or_create_customer	
  customer_id = payment_detail.credit_card_auth_code
  return create_customer if customer_id.blank?
  customer = Stripe::Customer.retrieve(customer_id, api_key) <-- Here
  customer.deleted? ? create_customer : customer
end