It seems that when the mod is added halfway through a playthrough, at least in my case, causes it to throw an error on load about ticking.

Error while running event rd-timelapse-map::on_configuration_changed
rd-timelapse-map/control.lua:169: attempt to perform arithmetic on local 'tick' (a nil value)
stack traceback:
rd-timelapse-map/control.lua:169: in function 'tick_to_countdown'
rd-timelapse-map/control.lua:191: in function <rd-timelapse-map/control.lua:190>

Modlist here, not sure if any of these would factor in (but there's a bunch)
https://pastebin.com/8E3N5Xj6

If you need anything else, feel free to ask (and hopefully the forum notifies me.

I'll look into it, I didn't really test loading an existing save, I think I'll have to set up some sort of migration or something

Found the issue, it should properly handle setting and version changes since 1.0.3 .