A PHP Error was encountered

Severity: Notice

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

Filename: controllers/Courses.php

Line Number: 73

Backtrace:

File: /home/artbot/public_html/application/controllers/Courses.php
Line: 73
Function: _error_handler

File: /home/artbot/public_html/application/controllers/Courses.php
Line: 31
Function: course_single

File: /home/artbot/public_html/index.php
Line: 327
Function: require_once

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