Phusion Passenger + Workling + RabbitMQ

Question

Hi everyone, I am trying to deploy a RoR app that does some asynchronous task. I use workling for that and the message queue is RabbitMQ. This combination worked flawlessly with Starling but we decided to change the MQ for Rabbit. I read somewhere that I should include the following code in my environment.rb

require 'mq' 
if defined?(PhusionPassenger) 
  PhusionPassenger.on_event(:starting_worker_process) do |forked| 
    if forked 
      if EM.reactor_running? 
        EM.stop_event_loop 
        EM.release_machine 
        EM.instance_variable_set( '@reactor_running', false ) 
      end 
      Thread.current[:mq] = nil 
      AMQP.instance_variable_set('@conn', nil) 
    end 
    th = Thread.current 
    Thread.new{ 
      AMQP.connect(:host => 'localhost'){ 
        th.wakeup 
      } 
    } 
    Thread.stop 
  end 
end

But that now Apache fails completely with message: The server encountered an internal error or misconfiguration and was unable to complete your request