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Segfault with 19.04 on NixOS 19.09.git.239fffc

Using Wayland (sway) I get a segfault after loading a clip and trying to add it to the timeline. The timeline UI box never actually shows any timelines.

Here is the backtrace from the coredump:

#0  0x00007f3a2e70750a in QObject::setProperty(char const*, QVariant const&) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Core.so.5
#1  0x00000000008b53f3 in TimelineWidget::setTool(ProjectTool) ()
#2  0x00000000004e4808 in MainWindow::slotSetTool(ProjectTool) ()
#3  0x00007f3a2e6ff6af in QMetaObject::activate(QObject*, int, int, void**) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Core.so.5
#4  0x00007f3a32beb2df in QActionGroup::triggered(QAction*) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#5  0x00007f3a32bebdb9 in ?? () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#6  0x00007f3a2e6ff59b in QMetaObject::activate(QObject*, int, int, void**) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Core.so.5
#7  0x00007f3a32be7a32 in QAction::triggered(bool) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#8  0x00007f3a32bea04c in QAction::activate(QAction::ActionEvent) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#9  0x00007f3a32cd62fb in ?? () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#10 0x00007f3a32cd655d in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#11 0x00007f3a32dc49ca in QToolButton::mouseReleaseEvent(QMouseEvent*) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#12 0x00007f3a32c2e028 in QWidget::event(QEvent*) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#13 0x00007f3a32dc4a64 in QToolButton::event(QEvent*) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#14 0x00007f3a32bee17c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#15 0x00007f3a32bf65d8 in QApplication::notify(QObject*, QEvent*) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#16 0x00007f3a2e6cf7f8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Core.so.5
#17 0x00007f3a32bf4bcf in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool, bool) ()
   from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#18 0x00007f3a32c49280 in ?? () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#19 0x00007f3a32c4bb4a in ?? () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#20 0x00007f3a32bee17c in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#21 0x00007f3a32bf5700 in QApplication::notify(QObject*, QEvent*) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Widgets.so.5
#22 0x00007f3a2e6cf7f8 in QCoreApplication::notifyInternal2(QObject*, QEvent*) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Core.so.5
#23 0x00007f3a2eaa7b5b in QGuiApplicationPrivate::processMouseEvent(QWindowSystemInterfacePrivate::MouseEvent*) ()
   from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Gui.so.5
#24 0x00007f3a2eaa8cc5 in QGuiApplicationPrivate::processWindowSystemEvent(QWindowSystemInterfacePrivate::WindowSystemEvent*) ()
   from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Gui.so.5
#25 0x00007f3a2ea817bb in QWindowSystemInterface::sendWindowSystemEvents(QFlags<QEventLoop::ProcessEventsFlag>) ()
   from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Gui.so.5
#26 0x00007f3a2166e9ea in ?? ()
   from /nix/store/g83143pyn6sc1x1nqqjcamap4c2b1rbw-qtbase-5.12.0-bin/lib/qt-5.12/plugins/platforms/../../../../../f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5XcbQpa.so.5
#27 0x00007f3a2d7248e7 in g_main_context_dispatch () from /nix/store/jmssi6iwkif4dc9dka6j1gcc1jgmq011-glib-2.60.4/lib/libglib-2.0.so.0
#28 0x00007f3a2d724b20 in g_main_context_iterate.isra () from /nix/store/jmssi6iwkif4dc9dka6j1gcc1jgmq011-glib-2.60.4/lib/libglib-2.0.so.0
#29 0x00007f3a2d724bac in g_main_context_iteration () from /nix/store/jmssi6iwkif4dc9dka6j1gcc1jgmq011-glib-2.60.4/lib/libglib-2.0.so.0
#30 0x00007f3a2e72c7df in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Core.so.5
#31 0x00007f3a2e6cdb1a in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Core.so.5
#32 0x00007f3a2e6d6ff0 in QCoreApplication::exec() () from /nix/store/f9jj1dwb7vvmba9n57ph3g96fvnw3x28-qtbase-5.12.0/lib/libQt5Core.so.5
#33 0x00000000004b618e in main ()

Not sure if there is anything else I can provide you, I'm a bit novice at gdb.