SegFault in _XGetRequest () from /usr/lib/libX11.so.6 during "Import Appliance"

[uh]

Clicking on the File Selector in "Import Appliance" causes a segfault in VirtualBox 5.1

kernel: VirtualBox[32689]: segfault at 0 ip 00007fc02e1edf81 sp 00007fff44cf73b0 error 6 in libX11.so.6.3.0[7fc02e1a9000+13b000]

gdb backtrace (let me know if you want me to recompile with proper symbols):

Thread 1 "VirtualBox" received signal SIGSEGV, Segmentation fault.
0x00007fac3ecf7f81 in _XGetRequest () from /usr/lib/libX11.so.6
(gdb) bt
#0  0x00007fac3ecf7f81 in _XGetRequest () from /usr/lib/libX11.so.6
#1  0x00007fac3ecd2579 in XChangeProperty () from /usr/lib/libX11.so.6
#2  0x00007fac3ecef919 in XSetTransientForHint () from /usr/lib/libX11.so.6
#3  0x00007fac2f79d48e in ?? () from /usr/lib/qt/plugins/platformthemes/libqgtk3.so
#4  0x00007fac2f7a0121 in ?? () from /usr/lib/qt/plugins/platformthemes/libqgtk3.so
#5  0x00007fac3d47a780 in QDialogPrivate::setNativeDialogVisible(bool) () from /usr/lib/libQt5Widgets.so.5
#6  0x00007fac3d48cdc2 in QFileDialog::setVisible(bool) () from /usr/lib/libQt5Widgets.so.5
#7  0x00007fac3d47b631 in QDialog::exec() () from /usr/lib/libQt5Widgets.so.5
#8  0x00007fac3d48d635 in QFileDialog::getOpenFileUrl(QWidget*, QString const&, QUrl const&, QString const&, QString*, QFlags<QFileDialog::Option>, QStringList const&) () from /usr/lib/libQt5Widgets.so.5
#9  0x00007fac3d48d6fe in QFileDialog::getOpenFileName(QWidget*, QString const&, QString const&, QString const&, QString*, QFlags<QFileDialog::Option>) () from /usr/lib/libQt5Widgets.so.5
#10 0x00007fac3fbef8f5 in ?? () from /usr/lib/virtualbox/VirtualBox.so
#11 0x00007fac3fbefaac in ?? () from /usr/lib/virtualbox/VirtualBox.so
#12 0x00007fac3fdea168 in ?? () from /usr/lib/virtualbox/VirtualBox.so
#13 0x00007fac3ff48795 in ?? () from /usr/lib/virtualbox/VirtualBox.so
#14 0x00007fac3e3824e9 in QMetaObject::activate(QObject*, int, int, void**) () from /usr/lib/libQt5Core.so.5
#15 0x00007fac3d376142 in QAbstractButton::clicked(bool) () from /usr/lib/libQt5Widgets.so.5
#16 0x00007fac3d376394 in ?? () from /usr/lib/libQt5Widgets.so.5
#17 0x00007fac3d377787 in ?? () from /usr/lib/libQt5Widgets.so.5
#18 0x00007fac3d377964 in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/libQt5Widgets.so.5
#19 0x00007fac3d44330a in QToolButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib/libQt5Widgets.so.5
#20 0x00007fac3d2d5f18 in QWidget::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#21 0x00007fac3d4433e9 in QToolButton::event(QEvent*) () from /usr/lib/libQt5Widgets.so.5
#22 0x00007fac3d28ee3c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#23 0x00007fac3d29746d in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQt5Widgets.so.5
#24 0x00007fac3e356c80 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /usr/lib/libQt5Core.so.5
#25 0x00007fac3d295b1d in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /usr/lib/libQt5Widgets.so.5

[uh]

Forgot to mention that I'm running Wayland. OS is Arch Linux.

(also, terribly sorry about the formatting)