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App crashes when clicking a URL or canceling a search.

When clicking a URL in a pdf, the app crashes.

The stacktrace indicates that clicking the URL also calls .CancelSearch():


ScrollViewEx.Accessibility (System.Boolean value)
ScrollViewEx.CancelSearch ()
ScrollViewEx+<>c__DisplayClass232_0.<HyperlinkNavigation>b__0 (System.Object sender, System.EventArgs e)
UIControlEventProxy.Activated () /Library/Frameworks/Xamarin.iOS.framework/Versions/12.8.0.2/src/Xamarin.iOS/UIKit/UIControl.cs:38
(wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr)
UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) /Library/Frameworks/Xamarin.iOS.framework/Versions/12.8.0.2/src/Xamarin.iOS/UIKit/UIApplication.cs:79
UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) /Library/Frameworks/Xamarin.iOS.framework/Versions/12.8.0.2/src/Xamarin.iOS/UIKit/UIApplication.cs:63


The same exception occurs when I call .CancelSearch() on the PdfViewer control, so the issue seems to be in the .CancelSearch() method.