On it!
Also so you are aware, this occurred as we have some new QA testers working on console release and it looks like they joined your Kingdom without realising that being on a newer version in an active live Kingdom can cause this error 
We have notified them asap to stop joining player Kingdoms (and maybe make their own). But if this occurs again, just let us know and we will continue to get them out of there.
7sins must be a great Kingdom though to have them keep wanting to join it!