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Issue was caused by two overrides:

1. /override/classes/Cart.php

2. /override/modules/ps_shoppingcart/ps_shoppingcart.php

One or both of these overrides were created by the module “Automatically add product to cart”. This caused no problem for a the last two years at least. Why it all of a sudden became a problem is not clear to me. Maybe Prestashop updated automatically and the original overrides became incompatible.

This issue was resolved for me by forum member J.Sahu https://www.prestashop.com/forums/profile/673902-jsahu/. He fixed it quickly at a reasonable price.

Issue was caused by two overrides:

1. /override/classes/Cart.php

2. /override/modules/ps_shoppingcart/ps_shoppingcart.php

One or both of these overrides were created by the module “Automatically add product to cart”. This caused no problem for a the last two years at least. Why it all of a sudden became a problem is not clear to me. Maybe Prestashop updated automatically and the original overrides became incompatible.

This issue was resolved for me by forum member J.Sahu https://www.prestashop.com/forums/profile/673902-jsahu/. He fixed the problem fast for a reasonable price.