While creating a database user in Plesk, getting the error:
Error: There are no database servers available for this subscription
/var/log/plesk/panel.log log contains the following:
PHP Notice: Undefined offset: 0 Line: 302 File: /opt/psa/admin/plib/Smb/Form/Final/Database/Abstract.php
Internal product issue #PPPM-2325.
The issue has been fixed in Parallels Plesk 12.0.18 MU#28 Install all MUs on your Plesk server.