Not enough stock for Product

Hi,

This message should normally be displayed by the code:

in administrator/components/com_hikashop/classes/cart.php
As you can see, it checks that the quantity of the product is equal to 0.
However, if I check the quantity of the product in the in the backend, it is set to unlimited and it doesn't have any bundled products (which could affect the calculated quantity if one of the bundled products had a quantity different than unlimited, and if the quantity of a bundled products would be 0, the main product quantity would be 0 too).
The only reason I can see is that there is a plugin implementing the event onBeforeProductQuantityCheck(&$products, &$cart, &$options) and dynamically modifying the product_quantity of the product.
I can see you have several custom plugins for HikaShop as well as third party plugins, so this increases the probability of the issue coming from a plugin.

I would recommend downloading the files of all the plugins in the plugins folder of Joomla and searching through all of them for the text "onBeforeProductQuantityCheck".
Hopefully, that will give a result and you can then check the code of that plugin.
If that doesn't yeld any result, then I would add some debug in administrator/components/com_hikashop/classes/cart.php around the code I pointed out. I would first use the hikashop_writeToLog($var) function to check the content of $product in the "payment log file" setting of the HikaShop configuration after a refused add to cart. That way, I would first be able to confirm that it comes from this piece of code with the product_quantity being set to 0. I would then move that debug to before the line:If the product_quantity is -1 (unlimited) at that point, it means that it comes from one of the plugins and you messed up with the search in the plugin files. If it's 0, then it means that it comes from something else before, and it would add the debug at the beginning of the function, etc.