A PHP Error was encountered

Severity: Notice

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

Filename: ref/Sys_menu_model.php

Line Number: 18

Backtrace:

File: /var/www/html/demoojek/application/models/ref/Sys_menu_model.php
Line: 18
Function: _error_handler

File: /var/www/html/demoojek/application/models/ref/Sys_menu_model.php
Line: 27
Function: get

File: /var/www/html/demoojek/application/models/ref/Sys_menu_model.php
Line: 9
Function: prepare_menu

File: /var/www/html/demoojek/application/controllers/Login.php
Line: 7
Function: __construct

File: /var/www/html/demoojek/index.php
Line: 292
Function: require_once