Backup completed with warnings:' broken sql base'

My nightly backup on macOS will occasionally complete with a warning indicating a ‘broken sql base’.
What does this mean and is it anything to be concerned about?

Thanks.

Hi John

Please send the diagnostic logs under Feedback button in the main window.
Our Support Team will get in touch with you shortly after we receive the diagnostics.

Thanks
Andy

Just an update regarding the case: looks like the issue is related the problems with the repository. Synchronization should fix the issue.