NoMethodError in UnternehmenController#produkt

undefined method `sort' for nil:NilClass

Extracted source (around line #42):
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@pm = Slistitem.where('slist_id=? AND title LIKE ?', 14, params[:url].to_s.gsub('_', '%') + '%').first
@bereich = Slistitem.where('slist_id=? AND type LIKE ? AND sort< ?', 14, 'SlistitemH1',
@pm.sort).order('sort').last.title
redirect_to action: 'produkte', url: nil unless @pm
end

Rails.root: /home/rene/www.jenapharm.de

Application Trace | Framework Trace | Full Trace

Request

Parameters:

{"url"=>"advantan_0_1_lösung"}

Response

Headers:

None