key(): Argument #1 ($array) must [VM4.0.7] [J4] [PHP 8.x]

[hazael]

I'm having the same problem again. To save the product I need to downgrade my PHP version from 8 to 7.4

key(): Argument #1 ($array) must be of type array, null given

[Milbo]

My site https://piekielko.com already officially works with Joomla 4 and Virtuemart 4. This is my first website made in Uikit - In my opinion, better than Bootsrap
I just need to work on performance - currently the site is not stored in the cache. The problem is, of course, the basket of products that I need to improve so that it reloads in AJAX. But I'll fix it in my spare time. The current site does a great job with PHP 8.0. I haven't tested it with PHP.8.1 yet

The standard core uses ajax, if enabled in VM config