Gin Explorer Design Error: integer division or modulo by zero

Triggered by: gift.html (line 36)

  34.     <ol class="breadcrumb">
  35.      {% set ns = (steps | length) %}
> 36.             {% set left_percent_increment = 100 // ns %}
  37.             {% set current_left_percent = 0 %}
  38.      <li class="step active">

Stack Trace:

Traceback (most recent call last):
  File "./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 "gift.html", line 3, in top-level template code
  File "base.html", line 168, in top-level template code
  File "gift.html", line 36, in block "page_header"
ZeroDivisionError: integer division or modulo by zero

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