A PHP Error was encountered

Severity: Notice

Message: Undefined index: User-Agent

Filename: homepage/header_v.php

Line Number: 19

Backtrace:

File: /home/dev/academy_app/application/views/homepage/header_v.php
Line: 19
Function: _error_handler

File: /home/dev/academy_app/application/controllers/Homepage.php
Line: 23
Function: view

File: /home/dev/academy_app/index.php
Line: 315
Function: require_once