combat_autosave/control.lua:9: attempt to index global 'player' (a nil value)

https://github.com/kid2407/CombatAutosave/issues/1
Probably, the problem related to headless servers

Thanks for reporting this error, I think I know why it happens, maybe should check if there are any players at all, since on the server there are none when it just started ^^

Ummm, and your variables are not in the global variable, btw. It means no sync between a server and clients.

And also
1. You didn't make local variables. For instance, control.lua:9: player = ... -> local player = ...
2. Put firstRun, saved, current_time_without_combat in global through on_init and on_configuration_changed
3. It'll be like: global.firstRun = global.firstRun or true

Valid points, guess I have some work to do ^^
For some of the stuff like global I didn't knew about when making this, but you always learn more and better ways to do stuff :)

Say me, which IDE do you using?

VSCode, why do you ask?

Just out of curiosity.