Error when clicking structure of group settings

Console output, Error reproduced in development, but exists also live:

Started GET "/groups/rainbow+the-cold-colors/structure" for 127.0.0.1 at 2018-01-04 13:08:20 +0100
Processing by Group::StructuresController#show as HTML
  Parameters: {"group_id"=>"rainbow+the-cold-colors"}
  User Load (0.5ms)  SELECT  `users`.* FROM `users` WHERE `users`.`id` = 4 LIMIT 1
  Group Load (0.6ms)  SELECT  `groups`.* FROM `groups` WHERE `groups`.`name` = 'rainbow+the-cold-colors'  ORDER BY `groups`.`id` ASC LIMIT 1
  Group Load (0.4ms)  SELECT  `groups`.* FROM `groups` WHERE `groups`.`id` = 3 LIMIT 1
  RequestToDestroyOurGroup Exists (0.5ms)  SELECT  1 AS one FROM `requests` WHERE `requests`.`type` IN ('RequestToDestroyOurGroup') AND (state = 'pending') AND `requests`.`requestable_type` = 'Group' AND `requests`.`requestable_id` = 32 LIMIT 1
  Rendered group/structures/show.html.haml within layouts/application (105.7ms)
Completed 500 Internal Server Error in 115ms (ActiveRecord: 2.0ms)

ActionView::Template::Error (undefined method `link_to_with_confirm' for #<#<Class:0x007f35d19dd8a8>:0x007f35e3294760>
Did you mean?  link_to_icon):
    24:       - else
    25:         - r.input :none.t
    26:       - r.info :network_description.t
    27:   - if destroy_group_link.present?
    28:     - f.row do |r|
    29:       - r.label :structure.t
    30:       - r.input destroy_group_link
  app/helpers/group/links_helper.rb:90:in `destroy_group_link'
  app/views/group/structures/show.html.haml:27:in `block in _app_views_group_structures_show_html_haml__2816599227234779948_69934563416340'
  vendor/crabgrass_plugins/crabgrass_formy/lib/formy/helper.rb:8:in `formy'
  app/views/group/structures/show.html.haml:1:in `_app_views_group_structures_show_html_haml__2816599227234779948_69934563416340'
  app/controllers/common/application/before_filters.rb:6:in `render'