The most generated errors being found on Opencart forum originates from contributed programming. The increased post counters are caused by redundancies of the same solutions that were already provided prior.
Programmer / Opencart Tester
Admin > Catalog > Products > Data
Then Edit the Stock Status or
Change the field 'Quantity' and also change 'Subtract Stock = Yes'
The below change will allow customer to order a product only if quantity is more than 0
Admin > System> Settings> Store> Option > Stock
-- Show Out Of Stock Warning = Yes
-- Stock Checkout = No
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