title: React Native: RCTFatal + 668
body: <p><a href="https://github.com/facebook/react-native/issues/27387" rel="nofollow noreferrer">I've also posted the issue in the React Native github repo, hoping to get some insight into the error.</a></p>
  
  <p>I've noticed that a not insignificant number of my iOS users experience the fatal error ( RCTFatal + 668 ) in production, resulting in the app crashing. The error occurs about 0.004 times per session, not terrible, but not great either. </p>
  
  <p>There seems to be no correlation between the error and what iOS version the user is running, the number of crashes seems to be directly tied to the number of sessions for each iOS version. What iOS device the user has doesn't seem to correlate with the error either.</p>
  
  <p>I'm unable to reproduce the error in local, staging, or production. </p>
  
  <p>Has anyone else had this error, and what can i do to debug this issue further?</p>
  
  <hr>
  
  <p><strong>react-native info</strong></p>
  
  <pre><code>System:
    OS: macOS Mojave 10.14.6
    CPU: (8) x64 Intel(R) Core(TM) i7-7920HQ CPU @ 3.10GHz
    Memory: 189.93 MB / 16.00 GB
    Shell: 3.2.57 - /bin/bash
  
  Binaries:
    Node: 12.8.0 - /usr/local/bin/node
    Yarn: 1.17.3 - /usr/local/bin/yarn
    npm: 6.4.1 - /usr/local/bin/npm
    Watchman: 4.9.0 - /usr/local/bin/watchman
  
  SDKs:
    iOS SDK:
      Platforms: iOS 13.2, DriverKit 19.0, macOS 10.15, tvOS 13.2, watchOS 6.1
    Android SDK:
      Android NDK: 20.0.5594570
  
  IDEs:
    Android Studio: 3.5 AI-191.8026.42.35.5977832
    Xcode: 11.2.1/11B500 - /usr/bin/xcodebuild
  
  npmPackages:
    react: 16.9.0 =&gt; 16.9.0
    react-native: 0.61.2 =&gt; 0.61.2
  </code></pre>
  
  <hr>
  
  <p><strong>Screenshot from crashes tab in Xcode</strong> (App name blurred for privacy)</p>
  
  <p><a href="https://i.stack.imgur.com/Tctwj.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Tctwj.png" alt="enter image description here"></a></p>
  
  <hr>
  
  <p><em><strong>P.S</strong> I'm aware that i'm not running the very latest version of RN. By the time i've upgraded RN, pushed to review, passed review, and got 2 weeks of crash reports there will always be a new version out. If this is known to be fixed in a later RN version, i will happily upgrade.</em></p>