Crash in Qt Designer when undocking/moving docks with tree widgets around

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff581476a in QWindow::mapFromGlobal (this=0xcc3690, pos=...) at kernel/qwindow.cpp:2105
2105        if (d->platformWindow && d->platformWindow->isEmbedded(0))
(gdb) where
#0  0x00007ffff581476a in QWindow::mapFromGlobal (this=0xcc3690, pos=...) at kernel/qwindow.cpp:2105
#1  0x00007ffff6655580 in QWidget::mapFromGlobal (this=0xc49ba0, pos=...) at kernel/qwidget_qpa.cpp:316
#2  0x00007ffff68d1bbf in QTreeView::drawTree (this=0xc97170, painter=0x7fffffffbd20, region=...) at itemviews/qtreeview.cpp:1422
#3  0x00007ffff68d1141 in QTreeView::paintEvent (this=0xc97170, event=0x7fffffffcab0) at itemviews/qtreeview.cpp:1280
#4  0x00007ffff662f747 in QWidget::event (this=0xc97170, event=0x7fffffffcab0) at kernel/qwidget.cpp:8028
#5  0x00007ffff6759ccb in QFrame::event (this=0xc97170, e=0x7fffffffcab0) at widgets/qframe.cpp:534
#6  0x00007ffff67f29a9 in QAbstractScrollArea::viewportEvent (this=0xc97170, e=0x7fffffffcab0) at widgets/qabstractscrollarea.cpp:1163
#7  0x00007ffff6887b7f in QAbstractItemView::viewportEvent (this=0xc97170, event=0x7fffffffcab0) at itemviews/qabstractitemview.cpp:1679
#8  0x00007ffff68d0ffc in QTreeView::viewportEvent (this=0xc97170, event=0x7fffffffcab0) at itemviews/qtreeview.cpp:1262
#9  0x00007ffff67f38b9 in QAbstractScrollAreaPrivate::viewportEvent (this=0xcab3c0, event=0x7fffffffcab0) at widgets/qabstractscrollarea_p.h:105
#10 0x00007ffff67f3980 in QAbstractScrollAreaFilter::eventFilter (this=0xcacd60, o=0xc49ba0, e=0x7fffffffcab0) at widgets/qabstractscrollarea_p.h:121
#11 0x00007ffff522edac in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x6953c0, receiver=0xc49ba0, event=0x7fffffffcab0) at kernel/qcoreapplication.cpp:967
#12 0x00007ffff65e70fb in QApplicationPrivate::notify_helper (this=0x6953c0, receiver=0xc49ba0, e=0x7fffffffcab0) at kernel/qapplication.cpp:3438
#13 0x00007ffff65e6f85 in QApplication::notify (this=0x7fffffffdcf0, receiver=0xc49ba0, e=0x7fffffffcab0) at kernel/qapplication.cpp:3407
#14 0x00007ffff522ea6a in QCoreApplication::notifyInternal (this=0x7fffffffdcf0, receiver=0xc49ba0, event=0x7fffffffcab0) at kernel/qcoreapplication.cpp:871
#15 0x00007ffff65e95f1 in QCoreApplication::sendSpontaneousEvent (receiver=0xc49ba0, event=0x7fffffffcab0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:235
#16 0x00007ffff66278d8 in QWidgetPrivate::drawWidget (this=0xcab970, pdev=0xd4b000, rgn=..., offset=..., flags=36, sharedPainter=0x0, backingStore=0xde63f0) at kernel/qwidget.cpp:5129
#17 0x00007ffff65f5865 in QWidgetBackingStore::sync (this=0xde63f0) at kernel/qwidgetbackingstore.cpp:1084
#18 0x00007ffff661ede1 in QWidgetPrivate::syncBackingStore (this=0xd9d3f0) at kernel/qwidget.cpp:1673
#19 0x00007ffff662fd7d in QWidget::event (this=0xd9c240, event=0xe79180) at kernel/qwidget.cpp:8166
#20 0x00007ffff6742e46 in QDockWidget::event (this=0xd9c240, event=0xe79180) at widgets/qdockwidget.cpp:1464
#21 0x00007ffff65e7124 in QApplicationPrivate::notify_helper (this=0x6953c0, receiver=0xd9c240, e=0xe79180) at kernel/qapplication.cpp:3442
#22 0x00007ffff65e6f85 in QApplication::notify (this=0x7fffffffdcf0, receiver=0xd9c240, e=0xe79180) at kernel/qapplication.cpp:3407
#23 0x00007ffff522ea6a in QCoreApplication::notifyInternal (this=0x7fffffffdcf0, receiver=0xd9c240, event=0xe79180) at kernel/qcoreapplication.cpp:871
#24 0x00007ffff52326cd in QCoreApplication::sendEvent (receiver=0xd9c240, event=0xe79180) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:232
#25 0x00007ffff522fb4a in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x695530) at kernel/qcoreapplication.cpp:1473
#26 0x00007ffff522f711 in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1333
#27 0x00007ffff57f351a in QWindowSystemInterface::sendWindowSystemEvents (flags=...) at kernel/qwindowsysteminterface.cpp:560
#28 0x00007fffeff3c5bb in QUnixEventDispatcherQPA::processEvents (this=0x69bcf0, flags=...) at eventdispatchers/qunixeventdispatcher.cpp:70
#29 0x00007ffff522b694 in QEventLoop::processEvents (this=0x7fffffffdc70, flags=...) at kernel/qeventloop.cpp:136
#30 0x00007ffff522b96d in QEventLoop::exec (this=0x7fffffffdc70, flags=...) at kernel/qeventloop.cpp:212
#31 0x00007ffff522f108 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1124
#32 0x00007ffff5805da6 in QGuiApplication::exec () at kernel/qguiapplication.cpp:1196
#33 0x00007ffff65e4307 in QApplication::exec () at kernel/qapplication.cpp:2689
#34 0x0000000000434897 in main (argc=1, argv=0x7fffffffde48) at main.cpp:57