A PHP Error was encountered

Severity: Notice

Message: Undefined offset: 0

Filename: helpers/theme_helper.php

Line Number: 11

Backtrace:

File: /var/www/html/mail/application/helpers/theme_helper.php
Line: 11
Function: _error_handler

File: /var/www/html/mail/application/controllers/Users.php
Line: 8
Function: set_theme

File: /var/www/html/mail/index.php
Line: 333
Function: require_once