A PHP Error was encountered

Severity: Warning

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

Filename: commonfiles/sidebar.php

Line Number: 21

Backtrace:

File: /home/appziate/public_html/washdash.appziatechnologies.com/application/views/pages/commonfiles/sidebar.php
Line: 21
Function: _error_handler

File: /home/appziate/public_html/washdash.appziatechnologies.com/application/views/pages/add_city.php
Line: 26
Function: include

File: /home/appziate/public_html/washdash.appziatechnologies.com/application/controllers/PageController.php
Line: 401
Function: view

File: /home/appziate/public_html/washdash.appziatechnologies.com/index.php
Line: 315
Function: require_once