#vulnerable code 
                              protected static int move(Location loc, Region region) {
    if (get().device.isSuspended()) {
      return 0;
    }
    if (loc != null) {
      IRobot r = null;
      r = Screen.getMouseRobot();
      if (r == null) {
        return 0;
      }
      if (!r.isRemote()) {
        get().device.use(region);
      }
      r.smoothMove(loc);
      r.waitForIdle();
      if (!r.isRemote()) {
        get().device.let(region);
      }
      return 1;
    }
    return 0;
  } 
                            #location 2 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                              protected static int move(Location loc, Region region) {
    if (get().device.isSuspended()) {
      return 0;
    }
    if (loc != null) {
      IRobot r = null;
      r = loc.getScreen().getRobot();
      if (r == null) {
        return 0;
      }
      if (!r.isRemote()) {
        get().device.use(region);
      }
      r.smoothMove(loc);
      r.waitForIdle();
      if (!r.isRemote()) {
        get().device.let(region);
      }
      return 1;
    }
    return 0;
  }