A PHP Error was encountered

Severity: 8192

Message: filter_var(): Passing null to parameter #3 ($options) of type array|int is deprecated

Filename: core/Input.php

Line Number: 572

Backtrace:

File: /home/ukhku/public_html/application/controllers/Mahasiswa_en.php
Line: 41
Function: ip_address

File: /home/ukhku/public_html/index.php
Line: 319
Function: require_once