A PHP Error was encountered

Severity: Warning

Message: Undefined array key "user_id"

Filename: pages/product-page.php

Line Number: 749

Backtrace:

File: /home/flipzon/public_html/application/views/front-end/classic/pages/product-page.php
Line: 749
Function: _error_handler

File: /home/flipzon/public_html/application/views/front-end/classic/template.php
Line: 77
Function: view

File: /home/flipzon/public_html/application/controllers/Products.php
Line: 447
Function: view

File: /home/flipzon/public_html/index.php
Line: 316
Function: require_once