A PHP Error was encountered

Severity: Warning

Message: Undefined array key "HTTP_REFERER"

Filename: controllers/User.php

Line Number: 2138

Backtrace:

File: /home/483292.cloudwaysapps.com/tvzmxqfvkg/public_html/application_ed538/controllers/User.php
Line: 2138
Function: _error_handler

File: /home/483292.cloudwaysapps.com/tvzmxqfvkg/public_html/index.php
Line: 315
Function: require_once