Unable to delete mail alias.

==== Required information ====
- iRedMail version: iRedAdmin-Pro 1.9.2
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx):Apache
- Linux/BSD distribution name and version:  CentOS 6 64bit
- Related log if you're reporting an issue:
====

While deleting a previously created alias, iRedAdmin Pro reports that "Selected accounts were deleted." but the alias is still in place.