Error while running event factoryplanner_fixed::on_init()
...ctoryplanner_fixed__/backend/handlers/generator_util.lua:46: attempt to index field '?' (a nil value)
stack traceback:
...ctoryplanner_fixed__/backend/handlers/generator_util.lua:46: in function 'combine_identical_products'
...ctoryplanner_fixed__/backend/handlers/generator_util.lua:110: in function 'format_recipe'
factoryplanner_fixed/backend/handlers/generator.lua:444: in function 'generate'
factoryplanner_fixed/backend/handlers/prototyper.lua:103: in function 'build'
factoryplanner_fixed/backend/init.lua:217: in function <factoryplanner_fixed/backend/init.lua:204>