PHP Error after upgrading to PHP 8.1

[bbeer]

we are getting following error 

PHP Deprecated: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in /.... /wire/core/WireInput.php:371

after upgrading to php 8.1 

Anyone else having this problem?

Just for reference, changing line 371 from 

if(!strlen($key)) return $this->cookieVars;

to

if(!$key || !strlen($key)) return $this->cookieVars;

seems to solve the problem. 

Edited February 13, 2023 by bbeer
added possible solution

[matjazp]

Yes, already reported here https://github.com/processwire/processwire-issues/issues/1467#issuecomment-1425013391 will be fixed in PW 3.0.212