itch.io

Coroutines are awkward to be fair. Did you try using something like this:

private IEnumerator coroutine;

//starting the coroutine

if (coroutine  == null)
{

     coroutine = YourIEnumerator();
     StartCoroutine(coroutine);

}

// Stopping the coroutine
StopCoroutine(coroutine);      
coroutine = null;