error adding new email address

virtualmin-htpasswd::mailbox_inputs failed : Bizarre copy of UNKNOWN in anonlist at /usr/libexec/webmin/virtualmin-htpasswd/virtual_feature.pl line 48.

File Line Function
/usr/libexec/webmin/web-lib-funcs.pl 2300 virtual_server::error
/usr/libexec/webmin/virtual-server/virtual-server-lib-funcs.pl 7093 virtual_server::foreign_call
/usr/libexec/webmin/virtual-server/edit_user.cgi 380 virtual_server::plugin_call
(eval 91) 6 (eval)
/usr/libexec/webmin/miniserv.pl 2104 (eval)
/usr/libexec/webmin/miniserv.pl 733 miniserv::handle_request

Status: 
Closed (fixed)