Sensei Lessons Archive sort by Menu Order

gistfile1.txt

/**
   * sensei_filter_lessons_archive function.
	 * @access public
	 * @param mixed $wp_query
	 * @return void
	 */
	function sensei_filter_lessons_archive( $wp_query ) {

		// Handle lesson archive page
		if ( is_post_type_archive( 'lesson' ) ) {
			set_query_var( 'orderby', 'menu_order' );
			set_query_var( 'order', 'ASC' );
		} // End If Statement

	} // End sensei_filter_lessons_archive()

add_action('pre_get_posts', 'sensei_filter_lessons_archive' );