A PHP Error was encountered

Severity: Notice

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

Filename: views/service_post.php

Line Number: 19

Backtrace:

File: /var/www/vhosts/drwho.com.tw/httpdocs/application/views/service_post.php
Line: 19
Function: _error_handler

File: /var/www/vhosts/drwho.com.tw/httpdocs/application/controllers/Treatment.php
Line: 42
Function: view

File: /var/www/vhosts/drwho.com.tw/httpdocs/index.php
Line: 315
Function: require_once