A PHP Error was encountered

Severity: Notice

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

Filename: ads/ad_detail.php

Line Number: 13

Backtrace:

File: /home/bubbasin/public_html/application/views/themes/ads/ad_detail.php
Line: 13
Function: _error_handler

File: /home/bubbasin/public_html/application/views/themes/layout.php
Line: 51
Function: view

File: /home/bubbasin/public_html/application/controllers/Category.php
Line: 51
Function: view

File: /home/bubbasin/public_html/index.php
Line: 315
Function: require_once