NullPointerException was often occurred in @EIntentService.onHandleIntent
This is the generated @EIntentService code,

    @Override
    public void onHandleIntent(Intent intent) {
        MyIntentService_.super.onHandleIntent(intent);
        String action = intent.getAction();
        if (ACTION_EXECUTE.equals(action)) {
            // ....
        }   

sometimes intent gets null, so intent.getAction() makes NPE.
And I could find the documentation from http://developer.android.com/reference/android/app/IntentService.html#onStartCommand(android.content.Intent,%20int,%20int)

The Intent supplied to startService(Intent), as given. This may be null if the service is being restarted after its process has gone away, and it had previously returned anything except START_STICKY_COMPATIBILITY.

I think it is safe to check whether intent is null.