When user rename virtualhost with already created SSL certificates to other name, and then - delete it, webmin fails to starts with error:
Starting Webmin server in /usr/share/webmin
Failed to open SSL key /home/old-virtual-host-name.org/ssl.key at /usr/share/webmin/miniserv.pl line 4420.
This happens, because Virtualmin don't delete old path of ssl key from file
Manually deleting lines from this file help solve this problem.