Dollar Shots Club Design Error: integer division or modulo by zero

Triggered by: subscribe_energy.html (line 33)

  31.       <ol class="breadcrumb">
  32.         {% set ns = (steps | length) %}
> 33.         {% set left_percent_increment = 100 // ns %}
  34.         {% set current_left_percent = 0 %}
  35.         <li class="step active">

Stack Trace:

Traceback (most recent call last):
  File "/src/cratejoy/cratejoy/theme/render.py", line 391, in render_page
    output = tpl.render(**kwargs)
  File "/usr/local/lib/python2.7/site-packages/jinja2/environment.py", line 1008, in render
    return self.environment.handle_exception(exc_info, True)
  File "/usr/local/lib/python2.7/site-packages/jinja2/environment.py", line 780, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "subscribe_energy.html", line 2, in top-level template code
  File "base.html", line 336, in top-level template code
  File "subscribe_energy.html", line 33, in block "page_content"
ZeroDivisionError: integer division or modulo by zero

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