A PHP Error was encountered

Severity: Notice

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

Filename: layouts/sidebar.php

Line Number: 53

Backtrace:

File: /var/www/html/sushainwebphp/application/views/website/layouts/sidebar.php
Line: 53
Function: _error_handler

File: /var/www/html/sushainwebphp/application/views/website/orders/orderhistory.php
Line: 18
Function: view

File: /var/www/html/sushainwebphp/application/controllers/Order.php
Line: 9272
Function: view

File: /var/www/html/sushainwebphp/index.php
Line: 316
Function: require_once