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What I was doing at the time of the crash - pressed `Q` during an autosave.

Early game, no mods besides elevated rails.

Thanks for the report - have you been able to reproduce this crash? It's crashing while trying to save a random resource entity which I've only ever seen on computers where the RAM/CPU were failing.

It only happened once so far. It is quite likely that something's wrong with the hardware of that computer. I will update if it happens again.