### Godot version

4.0.dev (c309de53997feff3286295fb2d71657f112a15db)

### System information

Linux, Nvidia, Vulkan

### Issue description

Editor segfaults when certain conditions are met when using the AnimationPlayer editor.

### Steps to reproduce

1. Create multiple animations, saved into a animation collection
2. Open an existing animation, then make a new empty animation
3. Change from seconds to fps, or add a new property to animate ()
4. Editor crashes

NOTE: It is slightly random and I have not found a perfect repro

### Minimal reproduction project

N/A (TBD?)
Ref<InputEventKey> k = p_ie;
	if (k.is_valid()) {
		switch (k->get_keycode()) {
			case Key::UP:
			case Key::DOWN:
			case Key::PAGEUP:
			case Key::PAGEDOWN: {
				pick_track->get_scene_tree()->get_scene_tree()->gui_input(k);
				pick_track->get_filter_line_edit()->accept_event();
			} break;
			default:
				break;
		}
	}
}
AnimationTrackEditor::AnimationTrackEditor() {