Cannot convert argument 1 from Object to Object

emilianop · April 6, 2026, 4:09am

Godot Version

4.6.stable.official

Question

I’m seeing a bunch of these errors int he debugger when the game runs

E 0:00:13:627   emit_signalp: Error calling from signal 'gui_input' to callable: 'Control(Action.gd)::_on_gui_input': Cannot convert argument 1 from Object to Object.
  <C++ Source>  core/object/object.cpp:1406 @ emit_signalp()

which I THINK are triggered by this piece of code:

func _on_gui_input(event: InputEventMouseButton) -> void:
    if event.button_index == MOUSE_BUTTON_LEFT and event.is_action_released("click"):
        do_something()

But I have no idea how to debug it and the app seems to run normally when I left-click on that Control

The source triggering it seems to be this:

github.com/godotengine/godot

core/object/object.cpp

89cea1439


      
          					Ref<Script> other_scr = target->get_script();
          					if (other_scr.is_valid() && !other_scr->is_tool()) {
          						// Trying to call not-tool method in editor, just ignore it.
          						continue;
          					}
          				}
          #endif
          				if (ce.error == Callable::CallError::CALL_ERROR_INVALID_METHOD && target && !ClassDB::class_exists(target->get_class_name())) {
          					// Most likely object is not initialized yet, do not throw error.
          				} else {
          					ERR_PRINT(vformat("Error calling from signal '%s' to callable: %s.", String(p_name), Variant::get_callable_error_text(callable, args, argc, ce)));
          					err = ERR_METHOD_NOT_FOUND;
          				}
          			}
          		}
          	}
          
          	for (uint32_t i = 0; i < slot_count; ++i) {
          		slot_callables[i].~Callable();
          	}

It’s just annoying because it’s flooding the output with those messages and it makes it tricky see the actual output I’m after.

gertkeno · April 6, 2026, 4:33am

You changed the function signature to InputEventMouseButton, but the signal emits InputEvent. Godot cannot up-cast every event to a mouse button.

Dizzy_Caterpillar · April 6, 2026, 4:48am

Do this instead:

func _on_button_gui_input(event: InputEvent) -> void:
	var iemb: InputEventMouseButton = event as InputEventMouseButton
	if iemb:
		prints("actual mouse button event", iemb.button_index)

emilianop · April 6, 2026, 4:52am

oh yep!

I need to go the whole route, don’t I


func _on_gui_input(event: InputEvent) -> void:
    if event is InputEventMouseButton:
        var mouseEvent:InputEventMouseButton = event as InputEventMouseButton
        if mouseEvent.button_index == MOUSE_BUTTON_LEFT and mouseEvent.is_action_released("click"):

emilianop · April 6, 2026, 4:52am

jinx

Dizzy_Caterpillar · April 6, 2026, 5:06am

It’s not necessary to check if a type conversion is possible using is before making the actual conversion with as. If the type conversion is not possible, as operator result is null.