Redmine

Steps to reproduce:

1. Open "My Page".
2. Add an any block. You will see "Invalid form authenticity token."

development.log:

There is an error "Can't verify CSRF token authenticity".

Started POST "/my/add_block" for 127.0.0.1 at 2017-07-25 11:00:28 +0900
Processing by MyController#add_block as HTML
  Parameters: {"utf8"=>"✓", "block"=>"issuequery"}
Can't verify CSRF token authenticity.
  AnonymousUser Load (0.3ms)  SELECT  "users".* FROM "users" WHERE "users"."type" IN ('AnonymousUser') ORDER BY "users"."id" ASC LIMIT ?  [["LIMIT", 1]]
  Rendering common/error.html.erb within layouts/base
  Rendered common/error.html.erb within layouts/base (1.5ms)
Filter chain halted as :verify_authenticity_token rendered or redirected
Completed 422 Unprocessable Entity in 28ms (Views: 24.5ms | ActiveRecord: 0.3ms)