Major Wraith frequently locks up with black screen

[Urlance Woolsbane]

I took a peak at code\mob\wraith.dm in the 2016 release, and it seems this sequence of code (lines 192-197) is culpable:

Code:

Move(var/turf/NewLoc, direct)
     if (loc)
          if (!isturf(loc) && !density)
              loc = get_turf(loc)
     else
          loc = locate(1,1,1)

What this doesn't explain is why the wraith's loc is getting set to null in the first place.

get_turf() is presumably responsible, though I don't know why, nor if the bug is even present in the 2016 release.