public function get_terms() {
		if ( ! $this->is_taxonomy() || ! taxonomy_exists( $this->get_name() ) ) {
			return null;
		}
		$terms = array();
		foreach ( $this->get_options() as $option ) {
			if ( is_int( $option ) ) {
				$term = get_term_by( 'id', $option, $this->get_name() );
			} else {
				// Term names get escaped in WP. See sanitize_term_field.
				$term = get_term_by( 'name', $option, $this->get_name() );

				if ( ! $term || is_wp_error( $term ) ) {
					$new_term = wp_insert_term( $option, $this->get_name() );
					$term     = is_wp_error( $new_term ) ? false : get_term_by( 'id', $new_term['term_id'], $this->get_name() );
				}
			}
			if ( $term && ! is_wp_error( $term ) ) {
				$terms[] = $term;
			}
		}
		return $terms;
	}