Sorry, which map block is it? I can see it's Dawn City, but I can't identify which one it is.
DAWNURBAN01. Bug already
reported to me and fixed in November last year
Which mods are you running? It's likely that they don't have the updated file
But what I'm curious is that I thought the Battlescape generator had been updated on a nightly around November that sanitized those kind of bad nodes so that they wouldn't be used and prevent this type of situations. Or maybe I'm mistaken?