The error message is as follows:
• An error message appears after the user changes the login password
PHP Deprecated: strtolower(): Passing null to parameter #1 ($string) of type string is deprecated in /home1/xxxx/public_html/xxx/qa-include/pages/account.php on line 215
PHP Deprecated: substr(): Passing null to parameter #1 ($string) of type string is deprecated in /home1/xxxxx/public_html/xxxx/qa-include/db/users.php on line 38
• On Site Notifications - Version 1.4.2
whenever user click on the notifications page. error message appear
PHP Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /home1/xxxxxx/public_html/xxx/qa-include/qa-base.php on line 1575
* My website is currently working with Version 1.8.7
and PHP 8.1