Deprecated function: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in email_registration_user_insert() (line 34 of modules/contrib/email_registration/email_registration.module).

Thanks, but wouldn't this result in

email_registration_cleanup_username('');

to break?

Maybe it would be better to make the email required in all cases if this module is enabled?

I agree with @Anybody here. Using this module without having the mail address required, doesn't make much sense. If anybody is willing to provide a patch, we could, of course have a look!

Duplicate of 📌 [2.x] E-mail should be required when admins create a user Needs work .

I created another patch supported for version 1.4.

I fixed another warning.