* @return int|false
	 */
	public function get_next_question( $last_question = null ) {

		$next = false;

		foreach ( $this->get_questions() as $question ) {

			if ( $next || is_null( $question['answer'] ) ) {
				return $question['id'];

				// When rewinding and moving back through we don't want to skip questions.
			} elseif ( $last_question && absint( $last_question ) === absint( $question['id'] ) ) {
				$next = true;
			}
		}

		return false;