diff --git a/app/controllers/nocheckout/stripe/checkout_sessions_controller.rb b/app/controllers/nocheckout/stripe/checkout_sessions_controller.rb
index 28a4a70..a28cafe 100644
--- a/app/controllers/nocheckout/stripe/checkout_sessions_controller.rb
+++ b/app/controllers/nocheckout/stripe/checkout_sessions_controller.rb
@@ -71,10 +71,10 @@ def concat_unescaped_stripe_checkout_session_id(url)
       # Retrives a customer from Stripe and returns a nil if the customer does not exist (instead)
       # of raising an exception, because this is not exceptional).
       def retrieve_customer(id:)
-        return nil if customer_id.blank?
+        return nil if id.blank?
 
         begin
-          Stripe::Customer.retrieve(String(customer_id))
+          Stripe::Customer.retrieve(String(id))
         # Blurg ... wish Stripe just returned a response object that's not an exception.
         rescue Stripe::InvalidRequestError => e
           case e.response.data