Minor (?) error on installing

FYI,
apt-get install webmin-virtualmin-password-recovery produces:

Use of uninitialized value $user in concatenation (.) or string at /usr/share/webmin/acl/acl-lib.pl line 1956.

SYSTEM INFORMATION
Operating system Debian Linux 10
Webmin version 1.981
Usermin version 1.823
Virtualmin version 6.17-3