### 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?)
Dictionary d = p_data;
	if (!d.has("type")) {
		return false;
	}
	String type = d["type"];
	if (type != "animation_track") {
		return false;
	}
	
	if (get_editor()->is_grouping_tracks()) {
		String base_path = animation->track_get_path(track);
		base_path = base_path.get_slice(":", 0); 
		if (d["group"] != base_path) {
			return false;
		}
	}
	if (p_point.y < get_size().height / 2) {
		dropping_at = -1;
	} else {
		dropping_at = 1;
	}
	const_cast<AnimationTrackEdit *>(this)->queue_redraw();
	return true;
}
void AnimationTrackEdit::drop_data(const Point2 &p_point, const Variant &p_data) {