message: check wether the executor has connection failure fallback
diff: @@ -173,7 +173,7 @@ async function finishPlaying() {
  }
  function catchPlayingError(message) {
  - if (executor.isReceivingEndError(message)) {
  + if (executor.isReceivingEndError && executor.isReceivingEndError(message)) {
  setTimeout(function() {
  playAfterConnectionFailed();
  }, 100);
  