Crash when completing fortress #86
Description
I've experienced buggy behavior that I believe is associated with the building of fortresses. I've attached SVE and MAP files for a saved game that demonstrates the bug (added .txt so github accepts the files). When the saved game is loaded, a settler is about to complete a fortress but the game appears to crash when the next turn begins. I'm assuming the bug has to do with the fortress somehow, but I can't be sure. I've also experienced some crashes when initiating fortress build (F), but that behavior isn't consistent.