Shopify sells out of stock items when already in cart

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We continue to sell items that are out of stock, even when "Continue selling when out of stock" is unchecked.


I've traced the issue back to customers that have added an item to their cart, leave, then purchase it later.

SKU 1234 has qty 1 available

Customer 1 adds SKU 1234 to his cart but does not purchase

Customer 2 adds SKU 1234 to his cart and purchases. Qty is reduced to 0.

Customer 1 purchases his cart. Qty is reduced to -1.


Has anyone figured out a way to prevent this from happening? Like preventing purchase from the cart if the quantity is 0?

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