title: Firebase crash on iOS in the queue com.google.firebase.auth.serialTaskQueue
body: <p>I am getting this crash in the crashlytics. However I never get during testing.
  Pod version is 3.16.0
  <a href="https://i.stack.imgur.com/FXhyy.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/FXhyy.jpg" alt="enter image description here"></a></p>
  
  <p>Someone help me.</p>