"Invalid query" caused by faceting

(only search action) IdeasController.rb

  def search
    @per_page = 20
    @page = (params[:page] && params[:page].to_i) || 1
    
    params[:category_filters] ||= {}
    
    all_ideas = Idea.search_tank(params['searchterm'],
      :category_filters => params[:category_filters]).select {
      |result| result.published?}
    @idea_count = all_ideas.length
    @idea_categories = Idea.search_tank(params['searchterm'],
      :category_filters => params[:category_filters]).categories
    all_comments = Comment.search_tank(params['searchterm'],
      :category_filters => params[:category_filters]).select {
      |result| result.published?}
    @comment_count = all_comments.length
    all_articles = Article.search_tank(params['searchterm'],
      :category_filters => params[:category_filters]).select {
      |result| result.published?}
    @article_count = all_articles.length
    all_citizens = Citizen.search_tank(params['searchterm'],
      :category_filters => params[:category_filters]).select {
      |result| result.published?}
    @citizen_count = all_citizens.length
    all_results = all_ideas + all_comments + all_articles + all_citizens
    
    @show_all_facets = !params[:category_filters][:type]
    @show_idea_state_facets = !params[:category_filters][:state]
    
    @results = all_results.paginate(page: @page, per_page: @per_page)
    @result_count = all_results.length
    
    @ideas = all_ideas & @results
    @comments = all_comments & @results
    @articles = all_articles & @results
    @citizens = all_citizens & @results
    
    KM.identify(current_citizen)
    track_clicks("idea", @ideas.length, @page)
    track_clicks("comment", @comments.length, @page)
    track_clicks("article", @articles.length, @page)
    track_clicks("citizen", @citizens.length, @page)
  end

error message

ArgumentError in IdeasController#search 
"Invalid query: (title\: OR summary\: OR body\: OR state\: OR author\: OR type\: OR __any:) __type:("Idea")"

Rails.root: /mnt/data/Avoin Ministerio/avoinministerio
Application Trace | Framework Trace | Full Trace 
app/controllers/ideas_controller.rb:184:in `search'
Request

Parameters: 
{"category_filters"=>{"type"=>["comment"]},
 "locale"=>"fi"}


Show session dump

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Response

Headers: 
None

IdeasController#search

  def search
    @per_page = 20
    @page = (params[:page] && params[:page].to_i) || 1
    
    params[:category_filters] ||= {}
    
    all_ideas = Idea.search_tank(params['searchterm'],
      :category_filters => params[:category_filters]).select {
      |result| result.published?}
    @idea_count = all_ideas.length
    @idea_categories = Idea.search_tank(params['searchterm'],
      :category_filters => params[:category_filters]).categories
    all_comments = Comment.search_tank(params['searchterm'],
      :category_filters => params[:category_filters]).select {
      |result| result.published?}
    @comment_count = all_comments.length
    all_articles = Article.search_tank(params['searchterm'],
      :category_filters => params[:category_filters]).select {
      |result| result.published?}
    @article_count = all_articles.length
    all_citizens = Citizen.search_tank(params['searchterm'],
      :category_filters => params[:category_filters]).select {
      |result| result.published?}
    @citizen_count = all_citizens.length
    all_results = all_ideas + all_comments + all_articles + all_citizens
    
    @show_all_facets = !params[:category_filters][:type]
    @show_idea_state_facets = !params[:category_filters][:state]
    
    @results = all_results.paginate(page: @page, per_page: @per_page)
    @result_count = all_results.length
    
    @ideas = all_ideas & @results
    @comments = all_comments & @results
    @articles = all_articles & @results
    @citizens = all_citizens & @results
    
    KM.identify(current_citizen)
    track_clicks("idea", @ideas.length, @page)
    track_clicks("comment", @comments.length, @page)
    track_clicks("article", @articles.length, @page)
    track_clicks("citizen", @citizens.length, @page)
  end