NoMethodError in Web#web_subcategory

Showing /var/www/vhosts/calzadosseijas.com/calzadosseijas/app/views/web/web_subcategory.html.erb where line #33 raised:

undefined method `category' for nil:NilClass

Extracted source (around line #33):

30
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<% end %>
<% end %>
],
item_list_id: <%= @products.first.category.id %>,
item_list_name: "<%= @products.first.category.name %>",
currency: "EUR",
},

Rails.root: /var/www/vhosts/calzadosseijas.com/calzadosseijas

Application Trace | Framework Trace | Full Trace
app/views/web/web_subcategory.html.erb:33:in `_app_views_web_web_subcategory_html_erb___1299440556609691138_47442150369500'

Request

Parameters:

{"id"=>"20-alpargatas-hombre"}

Response

Headers:

None