{% for s in segment_data.items %}
  {% if s == session_id %}
    {% assign _index = forloop.index0 %}
    {% break %}
  {% endif %}
{% endfor %}

{% assign _nidx = _index | plus: 1 %}
{% assign _next_segment = segment_data.items[_nidx] %}
{% assign _next_item = site.data.sessions[_next_segment] %}

{% if _index > 0 %}
  {% assign _pidx = _index | minus: 1 %}
  {% assign _prev_segment = segment_data.items[_pidx] %}
  {% assign _prev_item = site.data.sessions[_prev_segment] %}
{% endif %}

<section class="spacer center-align">

  {% include segment/nav.html segment=session_data.segment icon=1 %}

  <div class="paginator-container">
  {% include session/next_prev.html p="previous" item=_prev_item %}
  {% include session/next_prev.html p="next" item=_next_item %}
  </div>
</section>