My Android QT app crashes at qt_qFindChild_helper.

I have an Android QT app with more than has 14K active users at the moment of writing this post. The app is relatively stable, its crash rate is 0.34%:

but there is a specific user with Xiaomi Redmi 3 (ido), Android 5.1 that cannot even run the app on his device. When he starts the app, a white screen is displayed and then the app crashes. Google Play Console reports that he attempted to start the app 7 times, but with no success:

The backtrace is

*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
pid: 0, tid: 0 >>> net.geographx.LinesGame <<<

  #00  pc 00000000002b60e4  /data/app/net.geographx.LinesGame-1/lib/arm64/ (qt_qFindChild_helper(QObject const*, QString const&, QMetaObject const&, QFlags<Qt::FindChildOption>)+48)
  #01  pc 0000000000091c88  /data/app/net.geographx.LinesGame-1/lib/arm64/ (main+4956)
  #02  pc 0000000000032290  /data/data/net.geographx.LinesGame/qt-reserved-files/plugins/platforms/android/

QT version I build the app with is 5.13.0.

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