Problem with multitouch handling in gesture.lua

[maningame]

If you tap with more than 2 fingers on the touchscreen, the following error can appears (tested on multiple android devices in google chrome browser):

[ERROR:SCRIPT]: in/gesture.lua:196: attempt to index local 'state' (a nil value)

Traceback:

{"traceback":"stack traceback:\n  in\/gesture.lua:196: in function handle_touch\n  in\/gesture.lua:249: in function handle_multi_touch\n  in\/gesture.lua:295: in function <in\/gesture.lua:283>\n  (tail call):-1: ?\n  game\/common\/tutorial\/tutorial.gui_script:227: in function <game\/common\/tutorial\/tutorial.gui_script:226>\n","source":"lua"}

I conducted a mini-investigation; the problem is in this function:

function instance.on_input(action_id, action)
	if action.touch then
		if settings.multi_touch then
			if #action.touch == 2 then
				local t1 = action.touch[1]
				local t2 = action.touch[2]
				if current_touch_count < 2 then
					multi_states[t1.id] = create_touch_state()
					multi_states[t2.id] = create_touch_state()
					t1.pressed = true
					t2.pressed = true
				end
				handle_multi_touch(t1, t2)
			end
			current_touch_count = #action.touch
			return gestures
		end
	elseif action_id == settings.action_id then
		handle_single_touch(action)
		return gestures
	end
end

The state is set only for ids 1 and 2, but if you tap with more than 2 fingers, then t1.id / t2.id can differ from 1 and 2. As a result, an error occurs in the local function handle_multi_touch(t1, t2) when calling handle_touch(t1, s1) because s1 is nil.