NoMethodError in Coordinates#index

Showing /opt/soty/app/views/coordinates/index.html.slim where line #4 raised:

undefined method `label' for nil:NilClass
Extracted source (around line #3):
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module CoordinatesHelper
def coordinate_list_og_title
sentence = params[:staff_id].present? ? "#{@staff.label.name} #{@staff.name}" : 'ショップスタッフ'
sanitize "#{sentence}のスナップ一覧|Staffy(スタッフィ)"
end

Rails.root: /opt/soty

Application Trace | Framework Trace | Full Trace

Request

Parameters:

{"staff_id"=>"1790"}

Response

Headers:

None