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Using the following link with AIOSEO deactivated works fine:
mydomain.com/checkout/?clear-cart&add-to-cart=943
It clears the cart and places product ID 943 into the cart.
With the AIOSEO enabled, the following error appears: “Product is already in the cart.” Same result with other product IDs.
Problem only manifests itself for unauthenticated users. Once a user is logged it, there’s no error message under the same test.
URL without the “clear-cart” parameter also works fine. The issue appears to be only associated with the “clear-cart” parameter and only while AIOSEO is activated.