virtual mail: backup error and directory not cleaned after domain deleted

Hi,
after update from 1.2.2 to 1.2.3 , I received an i-MSCP Error Report

Quote

A critical error has been encountered while executing function main::run
in /var/www/imscp/engine/backup/imscp-backup-all.

Error was:

==========================================================================
main::run: The /var/mail/virtual/subdomain.mydomain.com mail directory doesn't
exist. Skipping backup... "

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I know that I've not email in this subdomain, so I think is wrong to receive an error (I don't receive error before update).

Also I go in directory /var/mail/virtual and I saw exist directory for deleted domain (different domain of a deleted user in imscp) and deleted subdomain (of an existant user and domain).

Someone can help?
Thank you!

Yeah, it's only the warning but is false positive
It's useful to have the warning if ther'is real problem, so instead of disable totally, maybe you can check which domain/email have to been checked for backup --> (for each domain/subdomain, if domain/subdomain have email check domain's email directory for backup).

Can you say me something about the mail directory that have to not be present but still exist in /var/mail/virtual?
I don't had canceled single mail but I had canceled domain or user, so maybe record of email are also present in database or email server's configuration (I don't know, I ask you).

Thank you!

Updated, thank you Nuxwin!