Upgrade guide??

Upgrade guide??

Is there an upgrade guide on how to move from Joomla 3 to 4 with Joomshopping 4.17.2 installed. Do one have to buy a new license some addons ?

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Aw: Upgrade guide??

I found the guide. I have now upgraded from Joomla 3 to 4.4.1 and to Joomshopping 5.2.2. When i try to add a product to cart I get this error:

0 count(): Argument #1 ($value) must be of type Countable|array, null given

Call stack
# Function Location
1 () JROOT/components/com_jshopping/Model/CartModel.php:57
2 count() JROOT/components/com_jshopping/Model/CartModel.php:57
3 Joomla\Component\Jshopping\Site\Model\CartModel->loadProductsFromTempCart() JROOT/components/com_jshopping/Model/CartModel.php:73
4 Joomla\Component\Jshopping\Site\Model\CartModel->load() JROOT/components/com_jshopping/Controller/CartController.php:46

Aw: Upgrade guide??

plugin for joomshopping instelled?

url?
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Try change code

file
components\com_jshopping\Model\CartModel.php
row 47

$this->products = $temp_cart->products;

change to

$this->products = $temp_cart->products ?? [];

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