A PHP Error was encountered

Severity: Warning

Message: Undefined array key "HTTP_REFERER"

Filename: controllers/Scan.php

Line Number: 33

Backtrace:

File: /home/u597203813/domains/registration.dentologyclinic.com/public_html/application/controllers/Scan.php
Line: 33
Function: _error_handler

File: /home/u597203813/domains/registration.dentologyclinic.com/public_html/index.php
Line: 308
Function: require_once