Hi, some mods add surfaces for internal purpose with hidden = true property, that aren't exposed to the player nor can be accessed without console commands or map editor, they do however appear in the ERM planet progression GUI (like that air purifier mod from my previous bug report).

Here's another example from the Quality Condenser mod

Could you add a check for hidden surfaces and exclude them from anything ERM GUI related?
https://lua-api.factorio.com/latest/concepts/SurfaceIdentification.html
https://lua-api.factorio.com/latest/classes/LuaForce.html#get_surface_hidden

Also I've noticed that it only shows proper force display name in the main ERM GUI window, everwhere else it shows internal force name like enemy_pentapod or enemy_erm_toss. Same for planet/surface names.

Thanks.

I'll take a look once the upcoming major changes are done.