Can't really understand which mod is causing it though.

Failed to load mods: ...istic-flashlight-fixed__/script/realistic-flashlight.lua:93: attempt to index field 'graphics_set' (a nil value)
stack traceback:
...istic-flashlight-fixed__/script/realistic-flashlight.lua:93: in main chunk
[C]: in function 'require'
realistic-flashlight-fixed/data.lua:2: in main chunk

Same issue here.

+1

+1

For me this happens when combining with https://mods.factorio.com/mod/radar-equipment

But when you are using it or if you just have both enabled? Cause I have it too and it might be the fix

Both enabled is enough to cause the crash upon load

This crash is because on that line the code for Realisitic Flashlight assumes spidertron.graphics_set exists, while it's actually optional (docs). This means this mod will crash with any other mod which creates invisible spiders.

I honestly completely forgot I even made this and noticed it on my github randomly lol, I'll see if I can fix it, thanks for the lead stringweasel

Wow this is probably one of the first times I've seen few people ask a question that went unanswered by the actual developer but got answered by one of the users!