StrReplace passing null to parameter as php 8.1 deprecation

I created a fix and merge request for the fix. I don't know, why the pipeline of the fork failed. :)
I hope the fix is easy and okay.

Shreya_th → made their first commit to this issue’s fork.

Shreya_th → closed merge request !84

Oh sorry, my change is a duplicate of str_replace throws php error when source contains null 🐛 str_replace throws php error when source contains null Fixed .
I close this one. :)

harkonn → closed merge request !83