A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type null

Filename: core/MY_Controller.php

Line Number: 13

Backtrace:

File: /var/www/html/aircraft_services/application/core/MY_Controller.php
Line: 13
Function: _error_handler

File: /var/www/html/aircraft_services/index.php
Line: 315
Function: require_once