A PHP Error was encountered

Severity: Warning

Message: foreach() argument must be of type array|object, null given

Filename: controllers/Teaching_Staff.php

Line Number: 23

Backtrace:

File: /home/u815793089/websites/d5fKt6LR9/public_html/application/controllers/Teaching_Staff.php
Line: 23
Function: _error_handler

File: /home/u815793089/websites/d5fKt6LR9/public_html/index.php
Line: 315
Function: require_once