App crash on iPhone with open combobox

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I have the following problem with my app on an iPhone (IOS 16.2).

 

For example, if I have a combo box or DateEdit or TimeEdit open in a form (items or dates or time is visible) and close the form using a button with Self.Close, the app breaks off completely. But this only occurs on the iPhone.

 

The form closes correctly on an IPad or Android device.

With the combo box I could still query whether it is open (DroppedDown = true) but with DateEdit or TimeEdit this does not work, for example.

 

How can i generally deal with this so that the app doesn't crash on an IPhone?