title: _hidden crash on Crashlytics using Bitrise - iOS App
body: <p>I am using Bitrise as a CI/CD on my iOS app.
  In the workflow there is a step to release the app via Fabric. 
  When a crash happens the only think I can see in the Dashboard is many <code>__hidden</code> steps on the stack. 
  I guess that this is because of some missing symbols but Fabric doesn't says that any symbol is missing. I tried to add them manually any way but I am still seeing the <code>__hidden</code> crashes.
  Any ideas of how can I fix this issue?</p>
  
  <p>Here is an example of what I get.
  <a href="https://i.stack.imgur.com/aMmAC.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aMmAC.png" alt="Fabric log"></a></p>