Error: INSERT INTO vouchers (user_id, jenis, persen, maksimal, waktu_dibuat, waktu_berakhir, durasi) 
        VALUES ('', '', '', '', '2026-01-27 18:27:41', '1970-01-01 07:00:00', '')<br>Cannot add or update a child row: a foreign key constraint fails (`bumc4515_toko`.`vouchers`, CONSTRAINT `fk_voucher_akun` FOREIGN KEY (`user_id`) REFERENCES `akun` (`id`) ON DELETE CASCADE)