Received error message Invariant Violation

I received the following error in Sensu backend 5.17.1. What does it mean?

Invariant Violation: Invariant Violation
at new InvariantError (
at invariant (
at StoreWriter.writeFieldToStore (
at Array.forEach ()
at StoreWriter.writeSelectionSetToStore (
at StoreWriter.writeResultToStore (
at CustomCache.InMemoryCache.write (
at DataStore.markQueryResult (
at QueryManager.markQueryResult (
at (
at notifySubscription (
at onNotify (
at (

Hey, thanks for reporting this exception. I’ve created a Github issue to track it, and it can be found here:

If you don’t mind going over to Github and adding any additional context (which page you were on, what you were trying to accomplish, etc.) that would greatly help in us replicating and fixing the issue.