MySQL Error: Cannot add or update a child row: a foreign key constraint fails (`timewebn_timeweb`.`cart`, CONSTRAINT `cart_FK2a` FOREIGN KEY (`product_id`) REFERENCES `product` (`pid`) ON UPDATE CASCADE)
MySQL Query: DB=timewebn_timeweb, SQL=INSERT INTO cart (session_id,product_id,qty) VALUES (8332766,636,1) ON DUPLICATE KEY UPDATE qty = qty+1
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