Error when adding product to cart – Call to getUid() on null in ProductController (TYPO3 v13.4.15)

[chrcan]

Hello, I'm working with TYPO3 v13.4.15 and using the extensions:

• extcode/cart
• extcode/cart-products

I followed the official tutorial to set everything up. However, when I try to add a product to the cart, I encounter the following error:

Core: Exception handler (WEB): Uncaught TYPO3 Exception: Call to a member function getUid() on null Error thrown in file /var/www/html/vendor/extcode/cart-products/Classes/Controller/ProductController.php in line 327. Requested URL: https://website.ddev.site/produkte/detail.html?tx_cart_cart%5Baction%5D=add&tx_cart_cart%5Bcontroller%5D=Cart%5CProduct&cHash=31934542a2e732a8a848ed38907f060f

To make sure it's not project-specific, I tested the same setup in a different TYPO3 project — but the error still occurs in exactly the same way.

Steps to reproduce:

1. Install TYPO3 v13.4.15
2. Install and configure extcode/cart and extcode/cart-products using the tutorial
3. Open the detail page of a product
4. Try to add the product to the cart

Expected behavior:

The product should be added to the cart without errors.

Actual behavior:

A fatal error occurs when submitting the add-to-cart action. It seems like a null value is passed where an object is expected in ProductController.php on line 327.

Additional context:

Let me know if you need any further logs or configuration details. Thanks in advance!

[chrcan]

I was able to fix the error — in my opinion, a TCA entry is missing!

In the database, it says: https://github.com/extcode/cart/blob/main/ext_tables.sql#L94 It's referenced here: https://github.com/extcode/cart/blob/main/Configuration/TCA/tx_cart_domain_model_order_tax.php#L21

But there is no TCA entry for it here: https://github.com/extcode/cart/blob/main/Configuration/TCA/tx_cart_domain_model_order_tax.php#L38-L65

Here's the code snippet that's missing in tx_cart_domain_model_order_tax.php:

    ],
    'columns' => [
        // --- HIER IST DIE FEHLENDE DEFINITION ---
        // Diese Konfiguration für 'record_type' behebt den Fehler.
        'record_type' => [
            'exclude' => 0,
            'label' => $_LLL . ':tx_cart_domain_model_order_tax.record_type',
            'config' => [
                'type' => 'select',
                'renderType' => 'selectSingle',
                'items' => [
                    [$_LLL . ':tx_cart_domain_model_order_tax.record_type.tax', 'tax'],
                    [$_LLL . ':tx_cart_domain_model_order_tax.record_type.total_tax', 'total_tax'],
                ],
                'default' => 'tax',
            ],
        ],
        'tax' => [