Redmineのfeature specでのエラー

sample.sh

% bundle exec rspec -I plugins/redmine_issue_badge/spec -e 'When Administrator' \
   --format documentation plugins/redmine_issue_badge/spec/features/badge_spec.rb
Run options: include {:full_description=>/When\ Administrator/}

IssueBadge
  When Administrator
    Global settings for badge option is displayed.
    Badge is displayed if global settings badge option is activated. (FAILED - 1)
    Badge is not displayed if global settings badge option is dectivated. (FAILED - 2)
    Issue badge block is displayed if global settings badge option is activated and click badge. (FAILED - 3)
    Issue badge polling is activate if polling option clicked. (FAILED - 4)

Failures:

  1) IssueBadge When Administrator Badge is displayed if global settings badge option is activated.
     Failure/Error: security_notification(user, sender, options).deliver_later

     ActiveJob::DeserializationError:
       Error while trying to deserialize arguments: Couldn't find AnonymousUser with 'id'=2 [WHERE "users"."type" IN ('AnonymousUser')]
     # ./app/models/mailer.rb:493:in `block in deliver_security_notification'
     # ./app/models/mailer.rb:492:in `each'
     # ./app/models/mailer.rb:492:in `deliver_security_notification'
     # ./app/models/user.rb:929:in `deliver_security_notification'
     # ./plugins/redmine_issue_badge/spec/features/badge_spec.rb:139:in `block (3 levels) in <top (required)>'
     # ------------------
     # --- Caused by: ---
     # ActiveRecord::RecordNotFound:
     #   Couldn't find AnonymousUser with 'id'=2 [WHERE "users"."type" IN ('AnonymousUser')]
     #   ./app/models/mailer.rb:493:in `block in deliver_security_notification'

user.rb

  # Send a security notification to all admins if the user has gained/lost admin privileges
  def deliver_security_notification
    options = {
      field: :field_admin,
      value: login,
      title: :label_user_plural,
      url: {controller: 'users', action: 'index'}
    }

    deliver = false
    if (admin? && saved_change_to_id? && active?) ||    # newly created admin
       (admin? && saved_change_to_admin? && active?) || # regular user became admin
       (admin? && saved_change_to_status? && active?)   # locked admin became active again

       deliver = true
       options[:message] = :mail_body_security_notification_add

    elsif (admin? && destroyed? && active?) ||      # active admin user was deleted
          (!admin? && saved_change_to_admin? && active?) || # admin is no longer admin
          (admin? && saved_change_to_status? && !active?)   # admin was locked

          deliver = true
          options[:message] = :mail_body_security_notification_remove
    end

    if deliver
      users = User.active.where(admin: true).to_a
      Mailer.deliver_security_notification(users, User.current, options)
    end
  end