public function is_current_screen( WP_Screen $screen = null ) {
		if ( null === $screen ) {
			if ( ! function_exists( 'get_current_screen' ) ) {
				return false;
			}
			$screen = get_current_screen();
		}

		if ( empty( $screen->id ) ) {
			return false;
		}

		if ( $screen->id !== $this->get_page_hook() ) {
			return false;
		}

		return true;
	}