[1104/010731:FATAL:browser_main_loop.cc(253)] Gtk: IA__gtk_widget_hide: assertion 'GTK_IS_WIDGET (widget)' failed

Program received signal SIGTRAP, Trace/breakpoint trap.
base::debug::(anonymous namespace)::DebugBreak () at ../../../../qtwebengine/src/3rdparty/chromium/base/debug/debugger_posix.cc:228
228     }
(gdb) bt
#0  base::debug::(anonymous namespace)::DebugBreak () at ../../../../qtwebengine/src/3rdparty/chromium/base/debug/debugger_posix.cc:228
#1  0x00007ffff1aadb16 in base::debug::BreakDebugger () at ../../../../qtwebengine/src/3rdparty/chromium/base/debug/debugger_posix.cc:247
#2  0x00007ffff1ae33e0 in logging::LogMessage::~LogMessage (this=0x7fffffffcf20, __in_chrg=<optimized out>)
    at ../../../../qtwebengine/src/3rdparty/chromium/base/logging.cc:601
#3  0x00007ffff01c2e18 in content::(anonymous namespace)::GLibLogHandler (log_domain=0x7fffdd60eb9b "Gtk", log_level=G_LOG_LEVEL_CRITICAL, 
    message=0xeb7670 "IA__gtk_widget_hide: assertion 'GTK_IS_WIDGET (widget)' failed", userdata=0x0)
    at ../../../../qtwebengine/src/3rdparty/chromium/content/browser/browser_main_loop.cc:253
#4  0x00007fffeb40fae1 in g_logv (log_domain=0x7fffdd60eb9b "Gtk", log_level=G_LOG_LEVEL_CRITICAL, format=<optimized out>, 
    args=args@entry=0x7fffffffd198) at /build/buildd/glib2.0-2.40.2/./glib/gmessages.c:1012
#5  0x00007fffeb40fd72 in g_log (log_domain=<optimized out>, log_level=<optimized out>, format=<optimized out>)
    at /build/buildd/glib2.0-2.40.2/./glib/gmessages.c:1071
#6  0x00007ffff7e81b64 in QGtk2Dialog::hide (this=0x6c2b20)
    at /home/kadam/gerrit/qt5/qtbase/src/plugins/platformthemes/gtk2/qgtk2dialoghelpers.cpp:136
#7  0x00007ffff7e82770 in QGtk2FileDialogHelper::hide (this=0x1212e70)
    at /home/kadam/gerrit/qt5/qtbase/src/plugins/platformthemes/gtk2/qgtk2dialoghelpers.cpp:272
#8  0x00007fffd448301d in QQuickPlatformFileDialog::~QQuickPlatformFileDialog (this=0x1212ba0, __in_chrg=<optimized out>)
    at /home/kadam/gerrit/qt5/qtquickcontrols/src/dialogs/qquickplatformfiledialog.cpp:175
#9  0x00007fffd4496104 in QQmlPrivate::QQmlElement<QQuickPlatformFileDialog>::~QQmlElement (this=0x1212ba0, __in_chrg=<optimized out>)
    at /home/kadam/gerrit/qt5-56-test/qtbase/include/QtQml/../../../../qt5/qtdeclarative/src/qml/qml/qqmlprivate.h:98
#10 0x00007fffd4496134 in QQmlPrivate::QQmlElement<QQuickPlatformFileDialog>::~QQmlElement (this=0x1212ba0, __in_chrg=<optimized out>)
    at /home/kadam/gerrit/qt5-56-test/qtbase/include/QtQml/../../../../qt5/qtdeclarative/src/qml/qml/qqmlprivate.h:98
#11 0x00007ffff6c10779 in qDeleteInEventHandler (o=0x1212ba0) at /home/kadam/gerrit/qt5/qtbase/src/corelib/kernel/qobject.cpp:4472
#12 0x00007ffff6c081c8 in QObject::event (this=0x1212ba0, e=0x154eb40) at /home/kadam/gerrit/qt5/qtbase/src/corelib/kernel/qobject.cpp:1247
#13 0x00007ffff7700d2a in QApplicationPrivate::notify_helper (this=0x467080, receiver=0x1212ba0, e=0x154eb40)
    at /home/kadam/gerrit/qt5/qtbase/src/widgets/kernel/qapplication.cpp:3717
#14 0x00007ffff76fe247 in QApplication::notify (this=0x7fffffffdb60, receiver=0x1212ba0, e=0x154eb40)
    at /home/kadam/gerrit/qt5/qtbase/src/widgets/kernel/qapplication.cpp:3160
#15 0x00007ffff6bce7d2 in QCoreApplication::notifyInternal2 (receiver=0x1212ba0, event=0x154eb40)
    at /home/kadam/gerrit/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1002
#16 0x00007ffff6bd271a in QCoreApplication::sendEvent (receiver=0x1212ba0, event=0x154eb40)
    at /home/kadam/gerrit/qt5/qtbase/src/corelib/kernel/qcoreapplication.h:227
#17 0x00007ffff6bcfb25 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=52, data=0x4671f0)
    at /home/kadam/gerrit/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1636
#18 0x00007ffff6bcf4ca in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=52)
    at /home/kadam/gerrit/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1494
#19 0x00007ffff6bcefa2 in QCoreApplication::exec () at /home/kadam/gerrit/qt5/qtbase/src/corelib/kernel/qcoreapplication.cpp:1279
#20 0x00007fffebc525e8 in QGuiApplication::exec () at /home/kadam/gerrit/qt5/qtbase/src/gui/kernel/qguiapplication.cpp:1561
#21 0x00007ffff76fdc2f in QApplication::exec () at /home/kadam/gerrit/qt5/qtbase/src/widgets/kernel/qapplication.cpp:2976
#22 0x00000000004022b2 in main (argc=1, argv=0x7fffffffdd48)
    at /home/kadam/gerrit/qtwebengine/examples/webengine/quicknanobrowser/main.cpp:82