insertion amount of a newly created product - php

Question

I'm creating a product on prestashop, I enter the amount with this function:
echo "1";
StockAvailable::setQuantity($id_prod, 0, $quantity,1);
echo "2";
the result is:
1fatal error
going on the backend, the product is and the amount set correctly.
How can I avoid the "fatal error"?
Report me error here: classes/Product.php in line 2582: if (!$id_cart && !isset($context->employee)) die(Tools::displayError());
This code is in the function "getPriceStatic". It is normal that it is pulled to perform "StockAvailable::setQuantity"?
I have not changed classes and I do not override

Answer 1

Usually I use this snippet (adapt it to your needs):
$shop_is_feature_active = Shop::isFeatureActive();
$shops = Shop::getContextListShopID();
if ($shop_is_feature_active) {
foreach ($shops as $shop) {
StockAvailable::setQuantity((int)$product->id, 0, (int)$product->quantity, (int)$shop);
}
} else {
StockAvailable::setQuantity((int)$product->id, 0, (int)$product->quantity, (int)$this->context->shop->id);
}
However, I always suggest to check if the product is in that shop.
It is important to check if
Context::getContext()->employee
is not empty, otherwise enter:
$psContext = Context::getContext();
if (!$psContext->employee) {
$psContext->employee = new Employee(PS_DEFAULT_EMPLOYEE);
}