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A PHP Error was encountered

Severity: Warning

Message: Undefined array key "user_id"

Filename: pages/product-page.php

Line Number: 639

Backtrace:

File: /var/www/bookhebook/eshop/Code_v2.9.0/application/views/front-end/classic/pages/product-page.php
Line: 639
Function: _error_handler

File: /var/www/bookhebook/eshop/Code_v2.9.0/application/views/front-end/classic/template.php
Line: 60
Function: view

File: /var/www/bookhebook/eshop/Code_v2.9.0/application/controllers/Products.php
Line: 468
Function: view

File: /var/www/bookhebook/eshop/Code_v2.9.0/index.php
Line: 315
Function: require_once