Cannot sync customers - KeyError Invoices #623

Issue Summary

Traceback (most recent call last):
File "/Users/andy/Desktop/Projects/nufios/nufios_wt/env/lib/python3.7/site-packages/stripe/stripe_object.py", line 83, in getattr
return self[k]
File "/Users/andy/Desktop/Projects/nufios/nufios_wt/env/lib/python3.7/site-packages/stripe/stripe_object.py", line 122, in getitem
raise err
File "/Users/andy/Desktop/Projects/nufios/nufios_wt/env/lib/python3.7/site-packages/stripe/stripe_object.py", line 111, in getitem
return super(StripeObject, self).getitem(k)
KeyError: 'invoices'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "./manage.py", line 12, in
execute_from_command_line(sys.argv)
File "/Users/andy/Desktop/Projects/nufios/nufios_wt/env/lib/python3.7/site-packages/django/core/management/init.py", line 381, in execute_from_command_line
utility.execute()
File "/Users/andy/Desktop/Projects/nufios/nufios_wt/env/lib/python3.7/site-packages/django/core/management/init.py", line 375, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/Users/andy/Desktop/Projects/nufios/nufios_wt/env/lib/python3.7/site-packages/django/core/management/base.py", line 316, in run_from_argv
self.execute(*args, **cmd_options)
File "/Users/andy/Desktop/Projects/nufios/nufios_wt/env/lib/python3.7/site-packages/django/core/management/base.py", line 353, in execute
output = self.handle(*args, **options)
File "/Users/andy/Desktop/Projects/nufios/nufios_wt/env/lib/python3.7/site-packages/pinax/stripe/management/commands/sync_customers.py", line 35, in handle
invoices.sync_invoices_for_customer(customer)
File "/Users/andy/Desktop/Projects/nufios/nufios_wt/env/lib/python3.7/site-packages/pinax/stripe/actions/invoices.py", line 135, in sync_invoices_for_customer
for invoice in customer.stripe_customer.invoices().data:
File "/Users/andy/Desktop/Projects/nufios/nufios_wt/env/lib/python3.7/site-packages/stripe/stripe_object.py", line 85, in getattr
raise AttributeError(*err.args)
AttributeError: invoices

If this is a bug instead of a question or feature request, please fill out the sections below.

Steps to Reproduce

This happens upon running ./manage.py sync_customers - not the initial use of it, but once putting in test customers

What were you expecting to happen?

Customers to sync

What actually happened?

The above error message