Product Bundles

There is a bug when taxes are disabled.

The bug is in this file:
Error:
An error of type E_ERROR was caused in line 2069 of the file /wp-content/plugins/woocommerce-product-bundles/includes/class-wc-pb-cart.php. Error message: Uncaught TypeError: array_merge(): Argument #1 must be of type array, null given in /wp-content/plugins/woocommerce-product-bundles/includes/class-wc-pb-cart.php:2069
Stack trace:
#0 /wp-content/plugins/woocommerce-product-bundles/includes/class-wc-pb-cart.php(2069): array_merge(NULL, NULL)
#1 /wp-includes/class-wp-hook.php(324): WC_PB_Cart->cart_shipping_packages(Array)

Function: cart_shipping_packages

Affected code:

$bundle_totals[ ‘line_tax_data’ ][ ‘total’ ] = array_merge( $bundle_totals[ ‘line_tax_data’ ][ ‘total’ ], $child_item_line_tax_data[ ‘total’ ] );
$bundle_totals[ ‘line_tax_data’ ][ ‘subtotal’ ] = array_merge( $bundle_totals[ ‘line_tax_data’ ][ ‘subtotal’ ], $child_item_line_tax_data[ ‘subtotal’ ] );

The issue is that when taxes are disabled, $bundle_totals[ ‘line_tax_data’ ][ ‘total’ ] is NULL and then array_merge throws the error.

A possible fix is to coalesce it with an empty array, like this:

$bundle_totals[ ‘line_tax_data’ ][ ‘total’ ] = array_merge( $bundle_totals[ ‘line_tax_data’ ][ ‘total’ ] ?? [], $child_item_line_tax_data[ ‘total’ ] ?? [] );
$bundle_totals[ ‘line_tax_data’ ][ ‘subtotal’ ] = array_merge( $bundle_totals[ ‘line_tax_data’ ][ ‘subtotal’ ] ?? [], $child_item_line_tax_data[ ‘subtotal’ ] ?? [] );