Product Sale Out of Stock Error

Hello,

A customer was able to buy a product that was Out Of Stock.
By theconfigurations of my store, I shouldn't be able to do this.

I had this problem in multiple stores.

Can anyone help?

Thanks.

I've experienced this as well, and I believe it's just how OpenCart functions out of the box. I'm pretty sure there are alerts that the item is out of stock on the view cart page at the least, but you can still checkout if you don't care. If you can, you should disable Out of Stock items to prevent them from being purchased.