[Spacewalk-list] Error syncing Fedora 26 channel

[Michael Watters]

When running spacewalk-repo-sync to sync a channel for Fedora 26 updates
I am getting an error as shown below.

09:16:46   Errata in repo: 3379.
09:16:55     Syncing 102 new errata to channel.
09:16:56 ERROR: Invalid severity: None
09:16:57 Sync of channel completed in 0:02:53.
09:16:57 Total time: 0:02:53

Does anybody know what would cause this?