The error it gave was:
Code: Select all
Error FluidBoxManager.cpp:520: Faulty fluidBox: 0x00007fac288acdd0, owner=air-filter-machine-2, position={15.5000000000, -7.5000000000}, bitmask=12288
Unfortunately, I did not make a note of which Factorio version I upgraded from, or which mods were updated or installed.
However, the "air-filter-machine-2" referenced in the error seems to be from the Better Air Filtering mod.
I am running Factorio on Gentoo Linux, amd64, kernel 4.19.2-ck
Update: It looks like this is the same issue as [0.18.12] Crash FluidBoxManager::save when saving