A PHP Error was encountered

Severity: Warning

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

Filename: frontend/header.php

Line Number: 59

Backtrace:

File: /home/vaccinescongress/public_html/application/views/frontend/header.php
Line: 59
Function: _error_handler

File: /home/vaccinescongress/public_html/application/views/frontend/scientific-programs.php
Line: 26
Function: view

File: /home/vaccinescongress/public_html/application/controllers/frontend/Scientific_Programs.php
Line: 190
Function: view

File: /home/vaccinescongress/public_html/application/controllers/frontend/Scientific_Programs.php
Line: 32
Function: index

File: /home/vaccinescongress/public_html/index.php
Line: 315
Function: require_once