On Factorio 1.1.104 (Steam), if I start a game, save, and try to actually load that game, I get the following error (I disabled all other mods just in case it was a conflict):

The mod Configurable Fogged Research (0.0.3) caused a non-recoverable error.
Please report this error to the mod author.

Error while running event ConfigurableFoggedResearch::on_load()
ConfigurableFoggedResearch/control.lua:182: attempt to index global 'game' (a nil value)
stack traceback:
ConfigurableFoggedResearch/control.lua:182: in function <ConfigurableFoggedResearch/control.lua:181>

Looking at the code, I think the fix is to delete line 217 of control.lua script.on_load(initialize_all) due to the documentation at https://lua-api.factorio.com/latest/auxiliary/data-lifecycle.html#[4]- saying game is not accessible from on_load handlers. You may have to reorganize things so your local variables are stored in global to let Factorio handle loading/saving, although I haven't read the code carefully enough to tell if that's needed.