Failure when copying lets encrypt certificate with "Copy to Webmin"

When copying certificate to Webmin the following error now occurs(it didn't before, server hasn't been reconfigured, only updates are applied).

Copying certificate and key to /etc/usermin ..
.. done
Configuring Usermin to use them ..
Failed to open /etc/usermin/miniserv.conf for writing : No such file or directory


Known bug, will be fixed in the upcoming 5.06 release of Virtualmin.