We've run into this error twice, once a month ago and again today. It's a low priority, but I just wanted to let you know. >(FunctionClauseError) no function clause matching in EventStore.Subscriptions.SubscriptionFsm.transition/3 It happened both times within about 100 milliseconds in 3 different subscribers (no one subscriber is in both groups). Sorry, I can't give you much more detail as the error message got truncated and I don't know the args for `transition`. [transition function from fsm](https://github.com/sasa1977/fsm/blob/master/lib/fsm.ex#L171)