A PHP Error was encountered

Severity: Notice

Message: Undefined offset: -1

Filename: frontend/C_f_frontend.php

Line Number: 202

Backtrace:

File: /home/vmat2021as/domains/vmat.com.vn/private_html/application/controllers/frontend/C_f_frontend.php
Line: 202
Function: _error_handler

File: /home/vmat2021as/domains/vmat.com.vn/private_html/index.php
Line: 98
Function: require_once