ActiveRecord::RecordNotFound in SubjectsController#show

ActiveRecord::RecordNotFound

Extracted source (around line #13):
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def show
@subject = Subject.find(params[:id])
@seo_title = @subject.title
set_meta_tags title: @subject.title,

Rails.root: /home/rails/gulag/releases/238

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Request

Parameters:

{"locale"=>"ru",
 "id"=>"solitary-confinement"}

Response

Headers:

None