public function generate() {

		if ( empty( $this->generator ) ) {
			return $this->error->add( 'missing-generator', __( 'No generator supplied.', 'lifterlms' ) );
		}

		global $wpdb;

		$wpdb->hide_errors();

		$wpdb->query( 'START TRANSACTION' ); // db call ok; no-cache ok.

		/**
		 * Action run immediately prior to a LifterLMS Generator running.
		 *
		 * @since 3.30.2
		 *
		 * @param LLMS_Generator $generator The generator instance.
		 */
		do_action( 'llms_generator_before_generate', $this );

		try {
			call_user_func( $this->generator, $this->raw );
		} catch ( Exception $exception ) {
			$this->error->add( $this->get_error_code( $exception->getCode(), $this->generator[0] ), $exception->getMessage(), $exception->getTrace() );
		}

		/**
		 * Action run immediately after a LifterLMS Generator running.
		 *
		 * @since 3.30.2
		 *
		 * @param LLMS_Generator $generator The generator instance.
		 */
		do_action( 'llms_generator_after_generate', $this );

		if ( $this->is_error() ) {
			$wpdb->query( 'ROLLBACK' ); // db call ok; no-cache ok.
		} else {
			$wpdb->query( 'COMMIT' ); // db call ok; no-cache ok.
		}

	}