从日志来看，提示原因是，匿名函数没有 stop 方法，追一下源码：

androidHybrid.cleanupChromedriver = function (chromedriver, cb) {
  if (chromedriver) {
    logger.debug("Cleaning up Chromedriver");
    chromedriver.stop(function (err) {
      if (err) logger.warn("Error stopping chromedriver: " + err.message);
      this.restoreProxyState();
      cb();
    }.bind(this));
  } else {
    cb();
  }
};

往上追一下：

Chromedriver.prototype.stop = function (cb) {
  logger.debug('Killing chromedriver');
  this.exitCb = cb;
  this.proc.kill();
};

再往上追

this.onChromedriverStart = cb;
  logger.debug("Spawning chromedriver with: " + this.chromedriver);
  var alreadyReturned = false;
  var args = ["--url-base=wd/hub", "--port=" + this.proxyPort, "--adb-port=" + ADB.getAdbServerPort()];
  this.proc = spawn(this.chromedriver, args);
  this.proc.stdout.setEncoding('utf8');
  this.proc.stderr.setEncoding('utf8');

  this.proc.on('error', function (err) {
    logger.error('Chromedriver process failed with error: ' + err.message);
    alreadyReturned = true;
    this.shuttingDown = true;
    logger.error('Killing chromedriver');
    this.proc.kill();
    this.onDie();
  }.bind(this));

能贴一下你的代码吗？