Atiq Rahman

Problem:
If you're experiencing an error stating 'Function product_type was called incorrectly' with WooCommerce Product Bundles, it's likely due to direct property access which is deprecated.
Solution:
We recommend applying a workaround detailed in our errata. First, ensure you have a full backup of your site. Then, navigate to the

…/wp-content/woocommerce-multilingual/compatibility/WcProductBundles/class-wcml-product-bundles.php

file and locate line 796. Replace:

if ( isset( $cart_item['bundled_items'] ) && $cart_item['data']->product_type === 'bundle' ) {

with:

if ( isset( $cart_item['bundled_items'] ) && $cart_item['data']->get_type() === 'bundle' ) {

This is a temporary fix, and a permanent solution will be included in future versions. For more details, visit the errata page here.

If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If issues persist, please open a new support ticket here.