I've had intermittent problems getting Fluent Reader to sync with my Nextcloud News instance. Usually it just fails. Wiping my settings and reconnecting doesn't help. Then a few days later it might work again, or it might not.

Today I finally got an error message linking to http://google.github.io/lovefield/error_lookup/src/error_lookup.html?c=202&p0=items.title

Constraint error: (202) Attempted to insert NULL value to non-nullable field items.title.

This may be from following a Mastodon user's RSS feed, which doesn't include titles (because the posts don't include titles), but removing all feeds without titles didn't fix the silent failure to sync.

This is running Fluent Reader on Windows.