A PHP Error was encountered

Severity: Notice

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

Filename: libraries/AccessControl.php

Line Number: 17

Backtrace:

File: D:\wwwroot\application\libraries\AccessControl.php
Line: 17
Function: _error_handler

File: D:\wwwroot\application\controllers\Report.php
Line: 18
Function: validate

File: D:\wwwroot\index.php
Line: 315
Function: require_once