Xcode 11 Storyboard builds crash released app

We have an app that has been in the iTunes store since 2011.
The latest release of XCode 11 has a bug in how it builds our app. We suspect something in how our storyboards are constructed. We use a lot of external references, and our external reference for a UINavigationBar raises a crash when our app is build for release.
Please advise.
I can provide sample code.

nice how Apple answered this.
Xcode 11 Storyboard builds crash released app
 
 
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