It's been a little bit since I've been here, but I'm back, I'm certain this is preventing my "cows" from being milked, it may have something to do with the fact that "autopump" is a boolean in the save files
Here's a simple fix, change line 2673 of expansion.gd from:
if result == "default":
to:
if typeof(result) == TYPE_STRING && result == "default":
Fixed in v.08.1 (though the whole Farm System is pending an update soon anyways)