Failed to insert item using cart Encoding of user_data must be unicode Replace product name rule in CI_Cart: PHP var $product_name_rules = '\.\:\-_ a-zA-ZsçÇöÖşŞıİğĞüÜ0-9'; 1 var $product_name_rules = '\.\:\-_ a-zA-ZsçÇöÖşŞıİğĞüÜ0-9'; https://github.com/bcit-ci/CodeIgniter/pull/2303