The mod Actual Craft Time 2.0 (0.6.7) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event Actual_Craft_Time_2::on_gui_click (ID 1)
Actual_Craft_Time_2/control.lua:138: attempt to perform arithmetic on field 'kr-dvanced-transport-belt' (a nil value)
stack traceback:
Actual_Craft_Time_2/control.lua:138: in function 'pbarTraits'
Actual_Craft_Time_2/control.lua:228: in function 'expandIngredients'
Actual_Craft_Time_2/control.lua:328: in function 'getRecipeFromEntity'
Actual_Craft_Time_2/control.lua:461: in function 'getRecipe'
Actual_Craft_Time_2/control.lua:768: in function 'run'
Actual_Craft_Time_2/control.lua:880: in function 'changeGuiSliderButtons'
Actual_Craft_Time_2/control.lua:918: in function <Actual_Craft_Time_2/control.lua:904>
Able to reproduce crash with lastest Krastorio2 mod, oil refinery set to basic oil processing, attempt to increase number of refineries from 2->3 results in above crash.
Edit, I was able to fix this myself, its just a typo in control.lua:138. "'kr-dvanced-transport-belt" is missing the a in advanced.