Error while running event liquid-transfer-tube::on_gui_click (ID 1)
liquid-transfer-tube/ltt_gui.lua:125: attempt to index local 'screen_lttFrame' (a nil value)
stack traceback:
liquid-transfer-tube/ltt_gui.lua:125: in function 'on_gui_click'
liquid-transfer-tube/control.lua:187: in function <liquid-transfer-tube/control.lua:186>
