A PHP Error was encountered

Severity: Notice

Message: Trying to access array offset on value of type bool

Filename: libraries/Cart.php

Line Number: 464

Backtrace:

File: /var/www/vhosts/cyklosvet.sk/httpdocs/application/views/themes/default/objects/cart.php
Line: 12
Function: total_items

File: /var/www/vhosts/cyklosvet.sk/httpdocs/application/core/MY_Controller.php
Line: 126
Function: view

File: /var/www/vhosts/cyklosvet.sk/httpdocs/application/controllers/Category.php
Line: 11
Function: __construct

File: /var/www/vhosts/cyklosvet.sk/httpdocs/index.php
Line: 263
Function: require_once