title: JSON value '<null>' of type NSNull cannot be converted to NSString
body: <p>I am getting the following error screen sometimes when I reload my React Native app in iOS Simulator.</p>
  
  <p><a href="https://i.stack.imgur.com/vkgNz.png" rel="noreferrer"><img src="https://i.stack.imgur.com/vkgNz.png" alt="enter image description here"></a></p>
  
  <p>Sometimes it doesn't happen at all but sometimes a few times during the day.</p>
  
  <p>I am using SignalR client in my app as well as Firebase Messaging.</p>
  
  <p>I have tried to put a <strong>try catch blocks</strong> to all of my app including where I use AsyncStorage but this is still happening.</p>
  
  <p>Very frustrating. </p>