A PHP Error was encountered

Severity: Notice

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

Filename: controllers/User.php

Line Number: 559

Backtrace:

File: /home4/writerco/public_html/application/controllers/User.php
Line: 559
Function: _error_handler

File: /home4/writerco/public_html/index.php
Line: 148
Function: require_once