CRASH: Unity iOS can't suspend AudioEngine in Background

Question

I'm trying to suspend the audioengine when the app goes into background on iOS.

I'm using the OnApllicationPause Callback in Unity like so:

    void OnApplicationPause(bool paused)
    {
        if (paused)
        {
            AkSoundEngine.Suspend();
            Debug.Log("ApplicationPaused" + paused);

        } else {
            AkSoundEngine.WakeupFromSuspend();
            Debug.Log("ApplicationBack" + paused);
        }
    }

I'm getting the following Error:

AK Error: Sound engine is not initialized or dummy sink is in use. Aborted.