A PHP Error was encountered

Severity: Notice

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

Filename: controllers/Dental.php

Line Number: 320

Backtrace:

File: /home/dental/public_html/application/controllers/Dental.php
Line: 320
Function: _error_handler

File: /home/dental/public_html/index.php
Line: 318
Function: require_once