Crash for Unknown Reason

[Moosfet]

Log file and save game attached. Uses Factorissimo 2 mod. Unfortunately I have no idea what caused it. I reloaded and repeated the same actions (nothing unusual, just setting up a machine), but it didn't crash again. Hopefully the log file is helpful.

Possibly (but probably not) worth noting is that my UPS was rather low, hovering around 35, and it also seemed to be locked to my FPS rather than, as usual, being independent of it.
I had restarted several times trying to resolve it (trying lower graphics settings) but as I wasn't able to resolve it I decided to just start playing, which is when the crash occurred. Strangely, after having restarted again after the crash, and a few more times since, the low UPS problem has mostly disappeared as its now about 50 instead of 35.

I have no idea what to make of any of this, as computers are supposed to be deterministic. I hope my RAM isn't going bad...

[Moosfet]

I ran memtest86+ for five hours, but it found no errors.

[posila]

Hi, thanks for the report.
Your RAM is most likely fine, the crash should be fixed in 0.15.16