Qt app IOS 12 crash on launch

jHi, after update of the IOS 12, some of our users start to receive crash launch on our QML application. When Accessibility -> Speech -> Speak Screen settings is on it is 100% reproducible. It is also reproducible with some other accessibility settings. Cause on mobile we don't need window title, cause it is not visible at all, it was empty string for our application. After a lot of investigation, I put a title for our application and it stop crashing, doesn't matter Speak Screen is enabled or not. For me, this is very very strange, but for now this fix our issue... But I am not sure, when it will start crashing again. Tested with Qt5.9.4. Callstack from fabric is attached. You can follow the whole discussion in: https://forum.qt.io/topic/95189/ios-12-crash-on-launch-exactly-after-splash-screen/5