A PHP Error was encountered

Severity: Warning

Message: Undefined array key "user_id"

Filename: pages/product-page.php

Line Number: 416

Backtrace:

File: /home/monther/cart.wheel.jo/application/views/front-end/classic/pages/product-page.php
Line: 416
Function: _error_handler

File: /home/monther/cart.wheel.jo/application/views/front-end/classic/template.php
Line: 34
Function: view

File: /home/monther/cart.wheel.jo/application/controllers/Products.php
Line: 324
Function: view

File: /home/monther/cart.wheel.jo/index.php
Line: 315
Function: require_once