public static function save_variations() {
		ob_start();

		check_ajax_referer( 'save-variations', 'security' );

		// Check permissions again and make sure we have what we need.
		if ( ! current_user_can( 'edit_products' ) || empty( $_POST ) || empty( $_POST['product_id'] ) ) {
			wp_die( -1 );
		}

		$product_id                           = absint( $_POST['product_id'] );
		WC_Admin_Meta_Boxes::$meta_box_errors = array();
		WC_Meta_Box_Product_Data::save_variations( $product_id, get_post( $product_id ) );

		do_action( 'woocommerce_ajax_save_product_variations', $product_id );

		$errors = WC_Admin_Meta_Boxes::$meta_box_errors;

		if ( $errors ) {
			echo '<div class="error notice is-dismissible">';

			foreach ( $errors as $error ) {
				echo '<p>' . wp_kses_post( $error ) . '</p>';
			}

			echo '<button type="button" class="notice-dismiss"><span class="screen-reader-text">' . esc_html__( 'Dismiss this notice.', 'woocommerce' ) . '</span></button>';
			echo '</div>';

			delete_option( 'woocommerce_meta_box_errors' );
		}

		wp_die();
	}