Check for null in loop

func collison_check():
    if hurt_by_overlaps == false or ghosting == true:
        pass
    if hurt_by_overlaps == true and ghosting == false:
        for body in suffocation_area.get_overlapping_bodies():
            if body.has_collision == true:
                if body.get_tree().has_group("Wall"):
                    if overlapping == false:
                        if test_prints == true:
                            print("Overlapping with " + body.Name)
                        overlapping = true

            if body == null:
                if overlapping == true:
                        if test_prints == true:
                            print(Name + " is no longer Overlapping with " + body.Name)
                        overlapping = false