### 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?)
if (!clicking_on_name) {
		return Variant();
	}
	Dictionary drag_data;
	drag_data["type"] = "animation_track";
	String base_path = animation->track_get_path(track);
	base_path = base_path.get_slice(":", 0); 
	drag_data["group"] = base_path;
	drag_data["index"] = track;
	Button *tb = memnew(Button);
	tb->set_flat(true);
	tb->set_text(path_cache);
	tb->set_icon(icon_cache);
	set_drag_preview(tb);
	clicking_on_name = false;
	return drag_data;
}
bool AnimationTrackEdit::can_drop_data(const Point2 &p_point, const Variant &p_data) const {