NoMethodError in SubjectsController#index

undefined method `scan' for nil:NilClass

Extracted source (around line #117):
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private
def extract_locale_from_accept_language_header
request.env['HTTP_ACCEPT_LANGUAGE'].scan(/^[a-z]{2}/).first
end
end

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

Application Trace | Framework Trace | Full Trace

Request

Parameters:

None

Response

Headers:

None