NoMethodError in DesignersController#show

undefined method `id' for nil:NilClass
Extracted source (around line #38):
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@designer = Designer.find_by(slug: params[:designer])
end
ahoy.track "View designer", designer: @designer.id
@products = @designer.products.checked_fabrics
@products_number = @products.count
@products = @products.order("lower(products.title)")

Rails.root: /var/www/justform

Application Trace | Framework Trace | Full Trace

Request

Parameters:

{"designer"=>"a-a-cooren-0", "format"=>"html"}

Response

Headers:

None