This truly is kind of pointless to be fair. We are talking about a base, yes, a BASE. There are no "rules" about what the base looks like, besides if it's inappropriate, you know what I mean! xD Now, it doesn't have to be removed, it is not harming your base is it? I don't think so.
I've had this happen to me once, it was nothing. Just someone had burnt a tree down with lava, and um.. set a bit of the others on fire.. But overall, it didn't burn the other builds in the party down.
You could always move your base, or just block it out with something beautiful! xD