A PHP Error was encountered

Severity: Warning

Message: Undefined array key "user_id"

Filename: pages/product-page.php

Line Number: 431

Backtrace:

File: /var/www/vhosts/stc.in.net/app.stc.in.net/application/views/front-end/classic/pages/product-page.php
Line: 431
Function: _error_handler

File: /var/www/vhosts/stc.in.net/app.stc.in.net/application/views/front-end/classic/template.php
Line: 35
Function: view

File: /var/www/vhosts/stc.in.net/app.stc.in.net/application/controllers/Products.php
Line: 321
Function: view

File: /var/www/vhosts/stc.in.net/app.stc.in.net/index.php
Line: 315
Function: require_once