yum update が "Error: Invalid version flag: if" を表示して失敗する

Issue

# yum update
ID-CD_epel_redhat-7                | 2.6 kB  00:00:00
ID-CD_epel_redhat-8                | 2.4 kB  00:00:00
rhel-7-server-rpms                 | 2.0 kB  00:00:00
(1/9): ID-CD_epel_redhat-7/group   | 392 kB  00:00:00
(2/9): ID-CD_epel_redhat-7/updateinfo                             | 892 kB  00:00:00
(3/9): ID-CD_epel_redhat-7/primary | 4.9 MB  00:00:00
(4/9): ID-CD_epel_redhat-8/group   | 121 kB  00:00:00
(5/9): ID-CD_epel_redhat-8/updateinfo                             | 455 kB  00:00:00
(6/9): ID-CD_epel_redhat-8/primary | 2.6 MB  00:00:00
(7/9): rhel-7-server-rpms/7Server/x86_64/group                    | 637 kB  00:00:00
(8/9): rhel-7-server-rpms/7Server/x86_64/updateinfo               | 4.1 MB  00:00:00
(9/9): rhel-7-server-rpms/7Server/x86_64/primary                  |  51 MB  00:00:00
ID-CD_epel_redhat-7                                 13592/13592
ID-CD_epel_redhat-8                                 7349/7349
rhel-7-server-rpms                                  31780/31780
.

Error: Invalid version flag: if