Stack level too deep - shipping_methods_controller_decorator

[bonekost]

Hello,
after trying to post new shipping method in admin I got server stacked.

Started POST "/admin/shipping_methods" for 127.0.0.1 at 2016-08-31 14:06:15 +0200
  ActiveRecord::SchemaMigration Load (2.0ms)  SELECT "schema_migrations".* FROM "schema_migrations"
Processing by Spree::Admin::ShippingMethodsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"wfaKkyjn0PqhRejMp8l9UiBdd+OiHe4Fev7RibbWc0R+AYlM7XsHQhmnhJzooDM8Z0fNnXbByno4WuefaPv9ZA==", "shipping_method"=>{"name"=>"GLS", "display_on"=>"", "admin_name"=>"gls", "code"=>"12", "tracking_url"=>"", "shipping_categories"=>["1"], "zones"=>["1"], "calculator_type"=>"Spree::Calculator::Shipping::FlexiRate", "tax_category_id"=>""}, "button"=>""}
  Spree::Preference Load (0.6ms)  SELECT  "spree_preferences".* FROM "spree_preferences" WHERE "spree_preferences"."key" = ? LIMIT 1  [["key", "spree/backend_configuration/locale"]]
  Spree::User Load (2.7ms)  SELECT  "spree_users".* FROM "spree_users" WHERE "spree_users"."deleted_at" IS NULL AND "spree_users"."id" = ?  ORDER BY "spree_users"."id" ASC LIMIT 1  [["id", 1]]
  Spree::Role Load (0.8ms)  SELECT "spree_roles".* FROM "spree_roles" INNER JOIN "spree_role_users" ON "spree_roles"."id" = "spree_role_users"."role_id" WHERE "spree_role_users"."user_id" = ?  [["user_id", 1]]
Completed 500 Internal Server Error in 738ms (ActiveRecord: 12.6ms)

SystemStackError (stack level too deep):
  app/controllers/spree/admin/shipping_methods_controller_decorator.rb:10:in `set_shipping_category'

I tried to use:

alias_method_chain :old_set_shipping_category, :set_shipping_category
alias_method_chain :old_set_zones, :set_zones

but no luck...

Spree v3.1.0
Rails v4.2.6