NoMethodError in ContenidosController#concept

undefined method `id' for nil:NilClass

Extracted source (around line #435):
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434
435
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@_portada= my_contenidos.where('tipo = 3 and indice = 1')
else
idcat= ContenidosCategorias.where('categoria=?',params[:cat]).first.id
@_portada= my_contenidos.where('tipo = 3 and indice = 1 and categoria=?', idcat)
end
if Rails.application.config.tipo_web=='news'

Rails.root: /var/www/vhosts/circulodeopinion.com/web

Application Trace | Framework Trace | Full Trace

Request

Parameters:

{"page"=>"1", "cat"=>"cartas%20al%20director"}

Response

Headers:

None