If a virtual server (and its sub-servers and user) get deleted during a backup, backup fails and is incomplete

Subject says it all: Backup stops if a domain is deleted after backup starts, instead of continuing trying to backup other domains existing on the server:

This is what comes out in the email result of backup:

Virtual server DELETEDDOMAIN_HERE.com cannot be backed up as it has been deleted!   <tt>setquota: user DELETEDDOMAIN_LINUX_USER_HERE does not exist. </tt> at ../web-lib-funcs.pl line 1427.
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Comments

Damn, Virtualmin is supposed to specifically detect and avoid this.

Was the deleted domain a sub-server or top-level domain?