A PHP Error was encountered

Severity: 8192

Message: rawurldecode(): Passing null to parameter #1 ($string) of type string is deprecated

Filename: helpers/common_helper.php

Line Number: 63

Backtrace:

File: /home/course/engine/helpers/common_helper.php
Line: 63
Function: rawurldecode

File: /home/course/engine/controllers/Lecture.php
Line: 65
Function: segment_to_array

File: /home/course/index.php
Line: 315
Function: require_once