i fixed like
FLUSH TABLES;
SHOW TABLE STATUS LIKE ‘cscart_orders’;
then i did
ALTER TABLE cscart_orders ENGINE = InnoDB;
ALTER TABLE cscart_orders AUTO_INCREMENT = 27038; //my last id+1
ALTER TABLE cscart_orders ENGINE = MyISAM;
everything is okey again.
you soudl fix the bug when i try to import orders to check for duplicated key and provide a notification to user.