A PHP Error was encountered

Severity: Notice

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

Filename: views/page_main_department.php

Line Number: 57

Backtrace:

File: C:\inetpub\wwwroot\tti\application\web_modules\web\views\page_main_department.php
Line: 57
Function: _error_handler

File: C:\inetpub\wwwroot\tti\application\third_party\MX\Loader.php
Line: 351
Function: include

File: C:\inetpub\wwwroot\tti\application\third_party\MX\Loader.php
Line: 294
Function: _ci_load

File: C:\inetpub\wwwroot\tti\application\web_modules\web\controllers\Department.php
Line: 23
Function: view

File: C:\inetpub\wwwroot\tti\index.php
Line: 315
Function: require_once