A PHP Error was encountered

Severity: Notice

Message: Undefined offset: 0

Filename: user/product.php

Line Number: 10

Backtrace:

File: /var/www/admin/data/www/matstep.ru/addendum/views/user/product.php
Line: 10
Function: _error_handler

File: /var/www/admin/data/www/matstep.ru/addendum/controllers/Main.php
Line: 320
Function: view

File: /var/www/admin/data/www/matstep.ru/index.php
Line: 315
Function: require_once