Fatal error: Uncaught mysqli_sql_exception: Duplicate entry '' for key 'employee_code' in /home/uznet/erp.2uz.net/api/add_employee.php:46 Stack trace: #0 /home/uznet/erp.2uz.net/api/add_employee.php(46): mysqli_query() #1 {main} thrown in /home/uznet/erp.2uz.net/api/add_employee.php on line 46