Whenever I add/remove a mod or adjust settings for the entire world, this mod causes an error when loading the saves making them unloadable

Error while running event supply-labs-with-construction-robots::on_configuration_changed
supply-labs-with-construction-robots/scripts/labs.lua:72: force index: 3, force name: neutral, size: 1
stack traceback:
[C]: in function 'error'
supply-labs-with-construction-robots/scripts/labs.lua:72: in function 'random_tick'
supply-labs-with-construction-robots/scripts/labs.lua:164: in function 'every_minute'
supply-labs-with-construction-robots/scripts/labs.lua:158: in function 'on_research_changed'
supply-labs-with-construction-robots/scripts/labs.lua:40: in function 'init'
supply-labs-with-construction-robots/control.lua:9: in function <supply-labs-with-construction-robots/control.lua:5>

sounds like it might be some compatibility issue since it makes very little sense to me, let me know if you're able to reproduce it and then send me a save.

Hello!
The same error, when I add some mod, then I can't load my save. At the same time, a new map was created, and there are no buildings yet (except for various ruins).
I can drop the save, but there are a lot of mods, if this does not prevent me from somehow finding the error, I will be glad.

Just in case, I'll send it right away - https://drive.google.com/file/d/1q9kHX-RgJC2eex7Q7rlVT9zglBBd0xXJ/view?usp=sharing

the cause of it is sadly not yet clear to me, if anyone ever manages to reproduce it with a minimal modlist and small save i'd love to take a peek at it.

And this is the save that can be used. I disabled all mods except Space Age, Elevated Rails, and Quality, and got an error.

wonderful, please send it over then

This is also a save, the link is just above.

oh, i didn't notice the edited message yet

Wow that's one hell of a locally modified modzip save :D

Failed to load mods:
• KS_Power_Rebalancing
• Missing required dependency KS_Power
• LargerLamps-2_0
• Incompatible with AfraidOfTheDark
• custom-space-map
• Missing required dependency Better_Starmap_Background
• promethium-processing
• Missing required dependency Better_Starmap_Background

Mods to be disabled:
• KS_Power_Rebalancing (2.0.7)
• LargerLamps-2_0 (0.2.1)
• custom-space-map (1.1.0)
• promethium-processing (1.0.4)

Either way, the issue should be fixed, not sure how that bug snuck in exactly since it was described in an older comment that it should work this way.

The save is loading, everything seems to be fine, thanks for the quick fix!