Started GET "/admin/incoming_addresses/4/edit" for 88.151.240.193 at 2017-08-22 15:09:30 +0200
Processing by V2::Admin::IncomingAddressesController#edit as HTML
  Parameters: {"id"=>"4"}
  Rendered v2/admin/incoming_addresses/_form.html.haml (16.8ms)
  Rendered v2/admin/incoming_addresses/edit.html.haml (20.6ms)
Completed 500 Internal Server Error in 47ms (ActiveRecord: 6.1ms)

ActionView::Template::Error (undefined method `sub' for true:TrueClass):
     8:         = f.label :address, :class => "form__label"
     9:         = f.text_field :address
    10:
    11:       - if @incoming_address.forwarding_address && !@incoming_address.example?
    12:         .inline-form-group
    13:           %label{:class => "form__label"}
    14:             = t('.forward_to')
  app/models/sources/incoming_address.rb:211:in `forwarding_address'
  app/views/v2/admin/incoming_addresses/_form.html.haml:11:in `block in _app_views_v__admin_incoming_addresses__form_html_haml__3174453178826172745_69980554342720'
  app/views/v2/admin/incoming_addresses/_form.html.haml:1:in `_app_views_v__admin_incoming_addresses__form_html_haml__3174453178826172745_69980554342720'
  app/views/v2/admin/incoming_addresses/edit.html.haml:3:in `_app_views_v__admin_incoming_addresses_edit_html_haml__4378127422973726267_69980554859100'
  app/controllers/v2/admin/incoming_addresses_controller.rb:35:in `edit'
  app/controllers/application_controller.rb:103:in `set_request_information_in_thread'