[0.90.6] Crash when clicking "Powered Stone Refinery" tech

[polycount]

Hi, guys. When trying to research the Powered Stone Refinery tech, the game immediately crashes. Bummer, too, because that's what I've been working towards for quite some time now. Hope this helps! I can't think of any other criteria that jumps out at me, but I did have 6 men, and I had the regular manual stone refinery as well.

Let me know if you need anymore info. This happens every time I do it, I've repeated it a few times now.