Much thanks! Turns out it was the mod I had just downloaded (obviously), I hadn't realized it affected roboports which stumped me at first.

Just updated a bunch of mods for factorio as well as enabled one new mod, factorio proceeds to CTD on reload.

Unfortunately, this also means it CTDs on launch, which does make it difficult to enable/disable mods from the ingame mod manager.

I've included the logfile but if anyone knows a way to ...