PHP 8.1 preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated

[hsegura]

What steps will reproduce the problem?

when use yii2/helpers/BaseInflector.php, function camel2word
line:
$label = preg_replace('/(?<=\p{Ll})\p{Lu}|(?<=[\p{L}\d])\p{Lu}(?=\p{Ll})|(\d+)/u', ' \0', $name);

What is the expected result?

not error

What do you get instead?

PHP Deprecated Warning – yii\base\ErrorException
preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated

Additional info

Q	A
Yii version	2.0.45
PHP version	8.1
Operating system	ubuntu

[virtual-designer]

What was your code? How you're trying to invoke that method? Please describe.

[hsegura]

[virtual-designer]

Please include the full stack trace. Right now I can only see the 3rd one, which is not enough for investigating the issue.

[hsegura]

sorry, my fault
it was missing to set the label attribute in the grid column