NameError: name 'preferred_phone' is not defined

[Philip James]

https://sentry.io/contactotter/contactotter/issues/164075054/

NameError: name 'preferred_phone' is not defined
(2 additional frame(s) were not displayed)
...
  File "channels/handler.py", line 227, in process_exception_by_middleware
    return super(AsgiHandler, self).process_exception_by_middleware(exception, request)

NameError: name 'preferred_phone' is not defined