Signature validation always true with IdP initiated SLO

[RomanKosovnenko]

Hello everyone,
In one project we use Omniauth with SAML.
And we always get valid signature even it should not be valid.
After debug, I figured out that the problem in method handle_logout_request

Method:
`def handle_logout_request(raw_request, settings)
logout_request = OneLogin::RubySaml::SloLogoutrequest.new(raw_request)

    if logout_request.is_valid? &&
      logout_request.name_id == session["saml_uid"]

      # Actually log out this session
      options[:idp_slo_session_destroy].call @env, session

      # Generate a response to the IdP.
      logout_request_id = logout_request.id
      logout_response = OneLogin::RubySaml::SloLogoutresponse.new.create(settings, logout_request_id, nil, RelayState: slo_relay_state)
      redirect(logout_response)
    else
      raise OmniAuth::Strategies::SAML::ValidationError.new("SAML failed to process LogoutRequest")
    end
  end`

It creates logout_request object without any settings. But validate_signature method use it with two keys "settings" and "get_params"

Maybe someone could explain is it my fault? Or how to fix it?