Error while running event compaktcircuit::on_gui_checked_state_changed (ID 3)
compaktcircuit/scripts/build.lua:1160: attempt to compare nil with number
stack traceback:
compaktcircuit/scripts/build.lua:1160: in function 'connect_iopole'
compaktcircuit/scripts/build.lua:1178: in function 'connect_all_iopoints'
compaktcircuit/scripts/editor.lua:851: in function 'set_packed'
compaktcircuit/scripts/editor.lua:815: in function 'handler'
compaktcircuit/scripts/tools.lua:273: in function 'previous'
compaktcircuit/scripts/tools.lua:272: in function <compaktcircuit/scripts/tools.lua:271>

Thanks for you report . Can you give me a saved game and the actions to reproduce the bug ?