A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type null

Filename: controllers/Sanpham.php

Line Number: 134

Backtrace:

File: /home/maylanh2/public_html/application/controllers/Sanpham.php
Line: 134
Function: _error_handler

File: /home/maylanh2/public_html/index.php
Line: 315
Function: require_once