A system-config-users bugfix update has been released for CentOS 7.

CentOS-announce: CEBA-2020:5030 CentOS 7 system-config-users BugFix Update

CentOS Errata and Bugfix Advisory 2020:5030

Upstream details at :   https://access.redhat.com/errata/RHBA-2020:5030

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

x86_64:
8862347f9d7582ff00f24363fe2ec9973c30d8b3a4bb2acbaffe35de8e6b6dc0 system-config-users-1.3.5-5.el7_9.noarch.rpm

Source:
5b81a24338eb09e02515eb70b05bb5aa8d2bd7b89b29d479b9105db9710dcb53 system-config-users-1.3.5-5.el7_9.src.rpm