A PHP Error was encountered

Severity: Notice

Message: Undefined index: user_id

Filename: pages/product-page.php

Line Number: 411

Backtrace:

File: /home/u483874956/domains/giazone.com/public_html/otp/application/views/front-end/classic/pages/product-page.php
Line: 411
Function: _error_handler

File: /home/u483874956/domains/giazone.com/public_html/otp/application/views/front-end/classic/template.php
Line: 53
Function: view

File: /home/u483874956/domains/giazone.com/public_html/otp/application/controllers/Products.php
Line: 323
Function: view

File: /home/u483874956/domains/giazone.com/public_html/otp/index.php
Line: 315
Function: require_once