I've sended a message, and put a link to this post in case more explanation is needed.
Oh ok.
I hope that can be fixed in the next releases, or maybe show a warning the player to not exit the game while in the edge of the map.
I thought it would be ok, because I had closed the game with the the boat and the ship spawned, and some times with only the ship, but I was nearby a island. I should had sailed back from the edge of the map...
That would be very...