Backorders are disabled in system > configuration > catalog > inventory but a customer bought a product with quantity 0, so after he purchased it, product's quantity became -1. How is it possible? I want that the customers can't buy a product with quantity 0.

1 Answer 1


You need to check below setting

In particular product setting -> Inventory -> Backorders set to "No Backorders".

System-> Configuration -> Catalog -> Inventory -> Product Stock Options -> Qty for Item's Status to Become Out of Stock set to "0".

Refer below Inventory settings.

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May be helpful to you.


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