NoMethodError in Pages#receive

Showing /home/pubweb/epWeb/app/views/pages/show.html.erb where line #58 raised:

undefined method `sub_title' for nil:NilClass

Extracted source (around line #58):

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<h3 id="subTitleEditable" data-editable=true data-field="sub_title" data-ck-void-save="true"><%= raw VPages::VPages.get(@Page.root.id,@lang).sub_title %></h3>
<% end %>
<% else %>
<h3><%= raw @PageParent.sub_title %></h3>
<% end %>
<ul class="list pageSubList">
<% if @Page.id == AppConfig.selfServicePageID || @Page.parent_id == AppConfig.selfServicePageID %>

Rails.root: /home/pubweb/epWeb

Application Trace | Framework Trace | Full Trace
app/views/pages/show.html.erb:58:in `_app_views_pages_show_html_erb___3737299411310516483_27352520'
app/controllers/pages_controller.rb:55:in `receive'

Request

Parameters:

{"urlName"=>"ru/pomo-ppi-papkovke/avtomaticheskaja-papkovka/povtopjajuiesja-vopposo"}

Response

Headers:

None