Peter Linehan - 2017-07-25

We have upgraded to 1.840 and are getting situations where users lose access.
The only errors I can find are in the miniserv.log where we get a large number of errors reproted as follows
Use of uninitialized value in concatenation (.) or string at /usr/libexec/webmin/acl/edit_group.cgi line 104.
Use of uninitialized value in string eq at /usr/libexec/webmin/acl/edit_group.cgi line 103.
Use of uninitialized value in string eq at /usr/libexec/webmin/acl/edit_group.cgi line 103.
Use of uninitialized value in string eq at /usr/libexec/webmin/acl/edit_group.cgi line 103.

These are repeated many times
and
also
Use of uninitialized value in pattern match (m//) at /usr/libexec/webmin/acl/index.cgi line 269.
Use of uninitialized value in pattern match (m//) at /usr/libexec/webmin/acl/index.cgi line 269.
Use of uninitialized value in pattern match (m//) at /usr/libexec/webmin/acl/index.cgi line 269.
Use of uninitialized value in pattern match (m//) at /usr/libexec/webmin/acl/index.cgi line 269.
Use of uninitialized value in pattern match (m//) at /usr/libexec/webmin/acl/index.cgi line 269.

and
Use of uninitialized value in concatenation (.) or string at /usr/libexec/webmin/acl/edit_user.cgi line 346.

Any ideas what is missing/happening and how to fix would be appreciated