About a month ago, I upgraded my website to (PHP- 8.1). And There were problems such as uploading and displaying avatars, local mail, and a lot of error messages (PHP Deprecated), However, after I used (bugfix-pupi1985), either by changing some codes or overwrite some files, all the error messages disappeared and the site now works fine.
: But one problem remained which is
PHP Deprecated: mb_strtolower(): Passing null to parameter #1 ($string) of type string is deprecated in /home1/xxxxxx/public_html/xxxxxx/qa-include/util/string.php on line 765)
This error appears in the error log after adding an answer, comment, or modification.
I will be very grateful and appreciative for your cooperation