Interesting, so it's possibly my player teleporting did cause it then (leaving behind an empty network?)
I have no clue how to replicate that but I will keep an eye out if it happens again

I checked all my auto saves (and my main save) to see if one would replicate the issue passively but it turned ...

I had just set 2 spidertrons to move from one area to another when the game crashed.
Loading the latest autosave crashed with the same reason, the previous autosave works fine.

Earlier in the session I'm pretty sure my player had been teleported from Nauvis to Vulcanus when exiting a remotely ...