Summary:
So much happened here in a short bit that hopefully the log and autosave right before the crash can help. I knew stuff was going wrong when the wall I’d just built disappeared. So I went to save and it crashed.
Aveauto_save.zip (5.2 MB)
stonehearth.log (51.1 KB)
Which wall is it? The one with the tunnel door? They built it just fine. I wonder if there’s a specific mod causing this. 
Was there a crash dmp?
There wasn’t a crash.dmp which was odd. Last one I have was dated the 22nd I think.
After I reloaded they built the tunnel door wall just fine so I couldn’t reproduce.