Using Native iOS UIViewController+UIWebView causes crash

Using Native iOS UIViewController+UIWebView causes a crash when the virtual keyboard is opened and closed rapidly, or in general usage. This is just one reproduction case. User provided pictures of crash's source context from debugging the process, they have been attached.

1. Download the attached project, unzip it, generate project files, compile the project and open the .uproject
2. Launch to an iOS device
3. Hit the button labled "4. Open" on the right side of the screen
4. Select the white space and then hit the "Done" button on the virtual keyboard
5. Repeat this multiple times
   Result: Within 30 seconds, the app will crash
   Expected: The app shouldn't crash from this

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