A PHP Error was encountered

Severity: 8192

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

Filename: onlineApplication/already_registered_login.php

Line Number: 217

Backtrace:

File: /var/www/html/application/views/prePhd/onlineApplication/already_registered_login.php
Line: 217
Function: urldecode

File: /var/www/html/application/controllers/prePhd/OnlineApplication.php
Line: 623
Function: view

File: /var/www/html/index.php
Line: 315
Function: require_once

Registered Name :
Registered E-mail :
Application No      :