App Crashing UITextField

I have an iPad App which is written in Swift 1.2 using XCode 6.4.

It has been available on the App Store since 2015,  and has been downloaded numerous times.

 

My users have been very happy with it, and it has been running without any problems on iOS 8 , 9, 10 and 11, as far as iOS 11.2.2.

 

However immediately after users upgraded to iOS 11.2.5 I started getting calls about the App crashing.

I have discovered that these crashes occur at random times, but always after segeuing into a class containing UITextFields.

 

I have changed the UITextFields into UITextViews and the crashes have stopped.

This is a big problem as it means a lot of changes thoughout the App, and textFields are much better for validation etc.

 

I am very worried about why my App seems to be effectively broken by the ipdate from iOS 11.2.2 to 11.2.5, and would be very grateful for any help.

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