there is a way to blacklist certain nodes but unfortunately I've got no idea how to do it myself, lol. however, I can tell you that you were really unlucky. when my bot flew into the minefield he got stuck there as well but after a few seconds he wrote into the log "blacklisting node" and then never flew there again. maybe try to fly in there with the bot on a few times and he will blacklist it as well? sorry, but I only got the bot yesterday and still don't know much about it
the bot blacklists certain spots because there are always mobs on top of it, or because of the thing Vinland wrote about. or maybe there was a player already at the node or near it. then he will avoid it as well.