NoMethodError in WebController#web_search

undefined method `[]' for nil:NilClass

Extracted source (around line #757):
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# @products = @products.includes(:brand).includes(:collection).where(:hidden => 0).page(params[:page]).per(24).order("collections.position ASC").order("brands.position ASC").order("products.name")
@products = Product.includes(:brand).includes(:collection).joins(:photos).distinct.where("product_number=? or products.name like ? or products.brand_name like ? or products.description like ? or products.composition like ?", params[:q]['name_cont'], "%#{params[:q]['name_cont']}%", "%#{params[:q]['name_cont']}%", "%#{params[:q]['name_cont']}%", "%#{params[:q]['name_cont']}%").where(:hidden => 0).page(params[:page]).per(24).order("collections.position, brands.position, products.price")
@string_searched = params[:q]['name_cont']
# @string_searched = @params["name_cont"]

Rails.root: /var/www/vhosts/trendclic.de/trendclicdetk

Application Trace | Framework Trace | Full Trace
app/controllers/web_controller.rb:757:in `web_search'

Request

Parameters:

None

Response

Headers:

None