**Steps to replicate the issue** (include links if applicable):
* Go to Special:RequestAccount page
* Complete and submit the following form to request a user account then click "Request Account" button
**What happens?**:
On the Special:RequestAccount confirmation page the following deprecated warning pops up:
```
Deprecated: strlen(): Passing null to parameter #1 ($string) of type string is deprecated in /var/www/html/extensions/ConfirmAccount/includes/backend/UserAccountRequest.php on line 93
```
```
Request account
Your account request has been sent and is now pending review. A confirmation email has been sent to your email address.
Return to Main Page.
```
6t
**What should have happened instead?**:
No deprecated warnings to show up.
**Software version** (on `Special:Version` page; skip for WMF-hosted wikis like Wikipedia):
* MW 1.43.1 + MySQL 8.4.5
* Confirm User Accounts (412aa12) 08:10, 21 January 2025
**Other information** (browser name/version, screenshots, etc.):