Call to a member function indexBy() on array

[franck-thorck]

Describe the bug

When I use wishlist/lists/add-to-cart in a form to add a list to the cart, it throws an error:

Call to a member function indexBy() on array

Steps to reproduce

1. Create a list
2. Add items to the list
3. Create a form to add the list to cart

Craft CMS version

5.5.5

Plugin version

3.0.4

Multi-site?

Yes for multi-language

Additional context

I upgrade a project from Craft CMS 4.x to Craft CMS 5.x.
It worked when the project was on Craft CMS 4.x.
When I use this code in "Add to cart" form:

{% for item in list.items %} <input type="hidden" name="purchasables[{{ item.id }}][qty]" value="{{ item.quantityWished }}"> {% if item.options|length %} <input type="hidden" name="purchasables[{{ item.id }}][options][width_eighth]" value="0"> <input type="hidden" name="purchasables[{{ item.id }}][options][length_eighth]" value="0"> {% for key, value in item.options %} {% if key == 'note' %} <input type="hidden" name="purchasables[{{ item.id }}][{{key}}]" value="{{value}}"> {% else %} <input type="hidden" name="purchasables[{{ item.id }}][options][{{key}}]" value="{{value}}"> {% endif %} {% endfor %} {% endif %} {% endfor %}

It returns a Variant class element in the addToCart function of ListController.php. If I remove this code, it returns the Purchasable class element, but I got this error then, but all my product types in the CMS is related to a tax category:

craft\commerce\base\Purchasable::getTaxCategory(): Return value must be of type craft\commerce\models\TaxCategory, null returned

[engram-design]

Fixed for the next release. To get this early, run composer require verbb/wishlist:"dev-craft-5 as 3.0.4".