Error in deleting virtual server

That number above appears to be a domain id.

I'm curious how many references you see to it if you run the following command:

find /etc/webmin/virtual-server | grep -v collected|xargs grep 121376854322583 | wc -l

There's generally a bunch, I'm curious if it's a particularly small number in your case.

And just for fun:

* What Virtualmin version are you using?

* What distro do you have?

Thanks,
-Eric

I've never seen anything like what you describe. Try upgrading to 3.58, and see if the problem persists. If it does, we'll probably want to see a bug in the bug tracker, including as much as you can recall about how you triggered the behavior.