Splendid Spoon Design Error: 'customer' is undefined

Triggered by: sub-update-restart.html (line 31)

  29.                         <tr>
  30.                             <td>
> 31.                                 <h1 style="font-weight: 400; font-family: OpenSans, sans-serif; font-size: 18px; color: black; line-height: 61px; margin-top: 5px; margin-left: 20px; text-align:left;">{{ customer.first_name }},</h1>
  32.                                 <div style="border-bottom: 1px solid #E0E0E0; width: 90%; margin: 5px auto;">
  33.                                     <h1 style="font-weight: 400; font-family: OpenSans, sans-serif; font-size: 20px; color: black; line-height: 30px; text-align: left;"> Congratulations on completing the <b>Holiday Glow</b>! We encourage you to continue your journey to your best self with Splendid Spoon. After your next delivery, your plan will continue at $95/week  </p><p>Want to change or cancel? Just click <a href="http://www.splendidspoon.com/customer/account">here</a> (you may be asked to log-in).</p>

Stack Trace:

Traceback (most recent call last):
  File "./cratejoy/theme/render.py", line 395, in render_page
    output = tpl.render(**kwargs)
  File "/home/ubuntu/cratejoy/venv/local/lib/python2.7/site-packages/jinja2/environment.py", line 1008, in render
    return self.environment.handle_exception(exc_info, True)
  File "/home/ubuntu/cratejoy/venv/local/lib/python2.7/site-packages/jinja2/environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "sub-update-restart.html", line 31, in top-level template code
  File "/home/ubuntu/cratejoy/venv/local/lib/python2.7/site-packages/jinja2/sandbox.py", line 385, in getattr
    value = getattr(obj, attribute)
UndefinedError: 'customer' is undefined

PSST: If you are the owner of this store, fix this error from the code editor. See the developer documentation for more information.