Send error log to email

The error (it could be a new notice or a new warning too) appears before the controller instance has been created. You can deal with this once, there is no need for email sending. For reporting the interesting errors, the email-sender is to be slightly reworked:

Code:

$ci =& get_instance();

if (is_object($ci)) {

    $ci->load->library('email');

    // ...
}