TypeError in SearchController#index

can't convert nil into Array

RAILS_ROOT: /home/jurg/rails_apps/musik-jobs

Application Trace | Framework Trace | Full Trace
/usr/share/rvm/gems/ruby-1.8.7-head/gems/will_paginate-2.3.17/lib/will_paginate/collection.rb:147:in `replace'
/usr/share/rvm/gems/ruby-1.8.7-head/gems/will_paginate-2.3.17/lib/will_paginate/collection.rb:147:in `replace'
/home/jurg/rails_apps/musik-jobs/lib/elasticsearch/api.rb:363:in `build_will_paginate'
/home/jurg/rails_apps/musik-jobs/lib/elasticsearch/api.rb:362:in `build_will_paginate'
/home/jurg/rails_apps/musik-jobs/lib/elasticsearch/api.rb:356:in `parse_result'
/home/jurg/rails_apps/musik-jobs/lib/elasticsearch/api.rb:238:in `search'
/home/jurg/rails_apps/musik-jobs/app/models/job.rb:397:in `search_with_elastic_search'
/home/jurg/rails_apps/musik-jobs/app/controllers/search_controller.rb:40:in `index'

Request

Parameters:

{"keyword"=>"lehrstelle",
 "plz"=>"",
 "portal"=>"",
 "canton"=>"",
 "beruf"=>"",
 "branch_option"=>"</a><a href=",
 "city"=>"",
 "personal"=>"",
 "company"=>"",
 "step"=>"",
 "page"=>"5",
 "radius"=>""}

Show session dump

Response

Headers:

{"Access-Control-Allow-Origin"=>"*",
 "Content-Type"=>"",
 "Cache-Control"=>"no-cache",
 "Access-Control-Allow-Methods"=>"*"}