From c259547dd7fed6077eb374c3ed9488fcf526c284 Mon Sep 17 00:00:00 2001
From: Michael Bianco <iloveitaly@gmail.com>
Date: Wed, 6 Jan 2016 21:45:29 -0500
Subject: [PATCH] Check for nil customer value when determining bitcoin
 receiver URL

Stripe API responses include `customer: nil`, which causes `refresh`
to throw an exception
---
 lib/stripe/bitcoin_receiver.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/stripe/bitcoin_receiver.rb b/lib/stripe/bitcoin_receiver.rb
index 819c7b4d..8b5f9efe 100644
--- a/lib/stripe/bitcoin_receiver.rb
+++ b/lib/stripe/bitcoin_receiver.rb
@@ -10,7 +10,7 @@ module Stripe
     end
 
     def url
-      if respond_to?(:customer)
+      if respond_to?(:customer) && !self.customer.nil?
         "#{Customer.url}/#{CGI.escape(customer)}/sources/#{CGI.escape(id)}"
       else
         "#{self.class.url}/#{CGI.escape(id)}"