onboard crashes in dock mode

Trying to display onboard in docked mode results in a segfault. A backtrace is attached.

#0 0x0000000000571413 in PyObject_Call (kw=0x0, arg=('_NET_WORKAREA',), func=<method at remote 0x7fffe5523098>) at ../Objects/abstract.c:2082
#1 PyEval_CallObjectWithKeywords (kw=0x0, arg=('_NET_WORKAREA',), func=<method at remote 0x7fffe5523098>) at ../Python/ceval.c:3947
#2 PyObject_CallObject (o=<method at remote 0x7fffe5523098>, a=('_NET_WORKAREA',)) at ../Objects/abstract.c:2072
#3 0x00007fffe5d7e077 in ?? () from /usr/lib/python3/dist-packages/Onboard/osk.cpython-33m-x86_64-linux-gnu.so
#4 0x00007ffff3aff461 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#5 0x00007ffff3aff713 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#6 0x00007ffff3ad46a8 in gdk_display_get_event () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#7 0x00007ffff3aff4e2 in ?? () from /usr/lib/x86_64-linux-gnu/libgdk-3.so.0
#8 0x00007ffff5b68216 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#9 0x00007ffff5b68568 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#10 0x00007ffff5b6896a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#11 0x00007ffff3ed1645 in gtk_main () from /usr/lib/x86_64-linux-gnu/libgtk-3.so.0
#12 0x00007ffff51aac18 in ffi_call_unix64 () from /usr/lib/x86_64-linux-gnu/libffi.so.6
#13 0x00007ffff51aa580 in ffi_call () from /usr/lib/x86_64-linux-gnu/libffi.so.6
#14 0x00007ffff607acc9 in g_callable_info_invoke () from /usr/lib/libgirepository-1.0.so.1
#15 0x00007ffff607c007 in g_function_info_invoke () from /usr/lib/libgirepository-1.0.so.1
#16 0x00007ffff62e6997 in ?? () from /usr/lib/python3/dist-packages/gi/_gi.cpython-33m-x86_64-linux-gnu.so
#17 0x0000000000591b92 in ext_do_call (nk=<optimized out>, na=<optimized out>, flags=<optimized out>, pp_stack=0x7fffffffd790,
    func=<built-in method invoke of gi.FunctionInfo object at remote 0x7fffe4a70f80>) at ../Python/ceval.c:4379
#18 PyEval_EvalFrameEx (
    f=f@entry=Frame 0x7fffe4a595c0, for file /usr/lib/python3/dist-packages/gi/types.py, line 113, in function (args=(), kwargs={}),
    throwflag=throwflag@entry=0) at ../Python/ceval.c:2720
#19 0x00000000005ac017 in PyEval_EvalCodeEx (_co=<optimized out>, globals=<optimized out>, locals=<optimized out>, args=<optimized out>,
    argcount=<optimized out>, kws=0xf2fd30, kwcount=0, defs=0x0, defcount=0, kwdefs=0x0, closure=(<cell at remote 0x7fffe5537670>,))
    at ../Python/ceval.c:3437
#20 0x00000000005905b9 in fast_function (nk=<optimized out>, na=<optimized out>, n=<optimized out>, pp_stack=0x7fffffffd990,
    func=<optimized out>) at ../Python/ceval.c:4165
#21 call_function (oparg=<optimized out>, pp_stack=0x7fffffffd990) at ../Python/ceval.c:4088
#22 PyEval_EvalFrameEx (
    f=f@entry=Frame 0xf2fb90, for file /usr/lib/python3/dist-packages/Onboard/OnboardGtk.py, line 103, in __init__ (self=<OnboardGtk(_bus_name=<BusName(_name='org.onboard.Onboard', _bus=<SessionBus(_bus_names=<WeakValueDictionary(_iterating=set(), _pending_removals=[], _remove=<function at remote 0x7ffff7ee4320>, data={'org.onboard.Onboard': <KeyedRef at remote 0x7fffe55bebf0>}) at remote 0x7fffec0d8550>, _signals_lock=<_thread.lock at remote 0x7ffff7f14490>, _Connection__call_on_disconnection=[], _bus_type=0, _signal_sender_matches={}, _signal_recipients_by_object_path={None: {'org.freedesktop.DBus': {'NameOwnerChanged': [<SignalMatch at remote 0x7fffe55f26c8>]}}}, _dbus_Connection_initialized=1) at remote 0x7fffeeb098f0>) at remote 0x7ffff65b6450>, status_icon=<Indicator(_keyboard_window=<KbdWindow(_maximized=False, supports_alpha=True, _client_offset=(0, 0), _window_rect=<Rect(x=49, y=563, h=205, w=1317) at remote 0x7fffe552ecd0>, icp=<IconPalette(_no_more_dwelling=False, _client_offset=(0, 0), _drag_start_rect=<Rect(x=...(truncated), throwflag=throwflag@entry=0) at ../Python/ceval.c:2679
#23 0x00000000005acdaa in PyEval_EvalCodeEx (closure=<optimized out>, kwdefs=<optimized out>, defcount=<optimized out>, defs=0x0,
    kwcount=<optimized out>, kws=<optimized out>, argcount=<optimized out>, args=<optimized out>, locals=0x0, globals=<optimized out>,
    _co=<code at remote 0x7ffff65d6660>) at ../Python/ceval.c:3437
#24 function_call.70414 (func=func@entry=<function at remote 0x7fffe55d3a70>,
    arg=arg@entry=(<OnboardGtk(_bus_name=<BusName(_name='org.onboard.Onboard', _bus=<SessionBus(_bus_names=<WeakValueDictionary(_iterating=set(), _pending_removals=[], _remove=<function at remote 0x7ffff7ee4320>, data={'org.onboard.Onboard': <KeyedRef at remote 0x7fffe55bebf0>}) at remote 0x7fffec0d8550>, _signals_lock=<_thread.lock at remote 0x7ffff7f14490>, _Connection__call_on_disconnection=[], _bus_type=0, _signal_sender_matches={}, _signal_recipients_by_object_path={None: {'org.freedesktop.DBus': {'NameOwnerChanged': [<SignalMatch at remote 0x7fffe55f26c8>]}}}, _dbus_Connection_initialized=1) at remote 0x7fffeeb098f0>) at remote 0x7ffff65b6450>, status_icon=<Indicator(_keyboard_window=<KbdWindow(_maximized=False, supports_alpha=True, _client_offset=(0, 0), _window_rect=<Rect(x=49, y=563, h=205, w=1317) at remote 0x7fffe552ecd0>, icp=<IconPalette(_no_more_dwelling=False, _client_offset=(0, 0), _drag_start_rect=<Rect(x=1280, y=686, h=63, w=64) at remote 0x7fffe4ab1b10>, _window_rect=<Rect(x=1280, y=686, h=63, w=64) at remot...(truncated), kw=kw@entry=0x0) at ../Objects/funcobject.c:633
#25 0x0000000000516f7c in PyObject_Call (kw=0x0,
    arg=(<OnboardGtk(_bus_name=<BusName(_name='org.onboard.Onboard', _bus=<SessionBus(_bus_names=<WeakValueDictionary(_iterating=set(), _pending_removals=[], _remove=<function at remote 0x7ffff7ee4320>, data={'org.onboard.Onboard': <KeyedRef at remote 0x7fffe55bebf0>}) at remote 0x7fffec0d8550>, _signals_lock=<_thread.lock at remote 0x7ffff7f14490>, _Connection__call_on_disconnection=[], _bus_type=0, _signal_sender_matches={}, _signal_recipients_by_object_path={None: {'org.freedesktop.DBus': {'NameOwnerChanged': [<SignalMatch at remote 0x7fffe55f26c8>]}}}, _dbus_Connection_initialized=1) at remote 0x7fffeeb098f0>) at remote 0x7ffff65b6450>, status_icon=<Indicator(_keyboard_window=<KbdWindow(_maximized=False, supports_alpha=True, _client_offset=(0, 0), _window_rect=<Rect(x=49, y=563, h=205, w=1317) at remote 0x7fffe552ecd0>, icp=<IconPalette(_no_more_dwelling=False, _client_offset=(0, 0), _drag_start_rect=<Rect(x=1280, y=686, h=63, w=64) at remote 0x7fffe4ab1b10>, _window_rect=<Rect(x=1280, y=686, h=63, w=64) at remot...(truncated), func=<function at remote 0x7fffe55d3a70>) at ../Objects/abstract.c:2084
#26 method_call.64992 (func=<function at remote 0x7fffe55d3a70>, func@entry=<method at remote 0x7ffff44450e0>,
    arg=(<OnboardGtk(_bus_name=<BusName(_name='org.onboard.Onboard', _bus=<SessionBus(_bus_names=<WeakValueDictionary(_iterating=set(), _pending_removals=[], _remove=<function at remote 0x7ffff7ee4320>, data={'org.onboard.Onboard': <KeyedRef at remote 0x7fffe55bebf0>}) at remote 0x7fffec0d8550>, _signals_lock=<_thread.lock at remote 0x7ffff7f14490>, _Connection__call_on_disconnection=[], _bus_type=0, _signal_sender_matches={}, _signal_recipients_by_object_path={None: {'org.freedesktop.DBus': {'NameOwnerChanged': [<SignalMatch at remote 0x7fffe55f26c8>]}}}, _dbus_Connection_initialized=1) at remote 0x7fffeeb098f0>) at remote 0x7ffff65b6450>, status_icon=<Indicator(_keyboard_window=<KbdWindow(_maximized=False, supports_alpha=True, _client_offset=(0, 0), _window_rect=<Rect(x=49, y=563, h=205, w=1317) at remote 0x7fffe552ecd0>, icp=<IconPalette(_no_more_dwelling=False, _client_offset=(0, 0), _drag_start_rect=<Rect(x=1280, y=686, h=63, w=64) at remote 0x7fffe4ab1b10>, _window_rect=<Rect(x=1280, y=686, h=63, w=64) at remot...(truncated), arg@entry=(), kw=kw@entry=0x0) at ../Objects/classobject.c:323
#27 0x000000000049eec1 in PyObject_Call (kw=0x0, arg=(), func=<method at remote 0x7ffff44450e0>) at ../Objects/abstract.c:2084
#28 slot_tp_init.6803 (
    self=self@entry=<OnboardGtk(_bus_name=<BusName(_name='org.onboard.Onboard', _bus=<SessionBus(_bus_names=<WeakValueDictionary(_iterating=set(), _pending_removals=[], _remove=<function at remote 0x7ffff7ee4320>, data={'org.onboard.Onboard': <KeyedRef at remote 0x7fffe55bebf0>}) at remote 0x7fffec0d8550>, _signals_lock=<_thread.lock at remote 0x7ffff7f14490>, _Connection__call_on_disconnection=[], _bus_type=0, _signal_sender_matches={}, _signal_recipients_by_object_path={None: {'org.freedesktop.DBus': {'NameOwnerChanged': [<SignalMatch at remote 0x7fffe55f26c8>]}}}, _dbus_Connection_initialized=1) at remote 0x7fffeeb098f0>) at remote 0x7ffff65b6450>, status_icon=<Indicator(_keyboard_window=<KbdWindow(_maximized=False, supports_alpha=True, _client_offset=(0, 0), _window_rect=<Rect(x=49, y=563, h=205, w=1317) at remote 0x7fffe552ecd0>, icp=<IconPalette(_no_more_dwelling=False, _client_offset=(0, 0), _drag_start_rect=<Rect(x=1280, y=686, h=63, w=64) at remote 0x7fffe4ab1b10>, _window_rect=<Rect(x=1280, y=686, h=63, w=64) at remote...(truncated), args=args@entry=(), kwds=kwds@entry=0x0) at ../Objects/typeobject.c:5580
#29 0x00000000004bf047 in type_call.6602 (type=<optimized out>, type@entry=0xf95120, args=args@entry=(), kwds=kwds@entry=0x0)
    at ../Objects/typeobject.c:754
#30 0x000000000058febd in PyObject_Call (kw=0x0, arg=(), func=<optimized out>) at ../Objects/abstract.c:2084
#31 do_call (nk=<optimized out>, na=<optimized out>, pp_stack=0x7fffffffdc50, func=<optimized out>) at ../Python/ceval.c:4287
#32 call_function (oparg=<optimized out>, pp_stack=0x7fffffffdc50) at ../Python/ceval.c:4090
#33 PyEval_EvalFrameEx (f=f@entry=Frame 0xa4fa40, for file ./onboard, line 16, in <module> (), throwflag=throwflag@entry=0)
    at ../Python/ceval.c:2679
#34 0x00000000005ac873 in PyEval_EvalCodeEx (closure=0x0, kwdefs=0x0, defcount=0, defs=0x0, kwcount=0, kws=0x0, argcount=0, args=0x0,
    locals=<optimized out>, globals=<optimized out>, _co=<code at remote 0x7ffff7ee4ae0>) at ../Python/ceval.c:3437
#35 PyEval_EvalCode (co=<code at remote 0x7ffff7ee4ae0>, globals=<optimized out>, locals=<optimized out>) at ../Python/ceval.c:771
#36 0x000000000041d263 in run_mod.21501 (mod=<optimized out>, filename=<optimized out>,
    globals={'__name__': '__main__', '__cached__': None, 'sys': <module at remote 0x7ffff7fc3d88>, 'unicode_literals': <_Feature(compiler_flag=131072, optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0)) at remote 0x7ffff65b6190>, '__builtins__': <module at remote 0x7ffff7fb5440>, 'chain_handler': <function at remote 0x7fffeeb11200>, '__file__': './onboard', 'Onboard': <type at remote 0xf95120>, '__author__': 'Chris Jones <email address hidden>', '__copyright__': 'Copyright © 2009 Chris Jones', '__doc__': None, '__loader__': <SourceFileLoader(path='./onboard', name='__main__') at remote 0x7ffff65f9dd0>, '__package__': None, 'print_function': <_Feature(compiler_flag=65536, optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0)) at remote 0x7ffff65b6150>, 'division': <_Feature(compiler_flag=8192, optional=(2, 2, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0)) at remote 0x7ffff6604bd0>},
    locals={'__name__': '__main__', '__cached__': None, 'sys': <module at remote 0x7ffff7fc3d88>, 'unicode_literals': <_Feature(compiler_flag=131072, optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0)) at remote 0x7ffff65b6190>, '__builtins__': <module at remote 0x7ffff7fb5440>, 'chain_handler': <function at remote 0x7fffeeb11200>, '__file__': './onboard', 'Onboard': <type at remote 0xf95120>, '__author__': 'Chris Jones <email address hidden>', '__copyright__': 'Copyright © 2009 Chris Jones', '__doc__': None, '__loader__': <SourceFileLoader(path='./onboard', name='__main__') at remote 0x7ffff65f9dd0>, '__package__': None, 'print_function': <_Feature(compiler_flag=65536, optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0)) at remote 0x7ffff65b6150>, 'division': <_Feature(compiler_flag=8192, optional=(2, 2, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0)) at remote 0x7ffff6604bd0>}, flags=<optimized out>, arena=<optimized out>) at ../Python/pythonrun.c:1981
#37 0x0000000000462d2e in PyRun_FileExFlags (fp=fp@entry=0xacf0d0, filename=filename@entry=0x7ffff7f159e0 "./onboard", start=start@entry=257,
    globals=globals@entry={'__name__': '__main__', '__cached__': None, 'sys': <module at remote 0x7ffff7fc3d88>, 'unicode_literals': <_Feature(compiler_flag=131072, optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0)) at remote 0x7ffff65b6190>, '__builtins__': <module at remote 0x7ffff7fb5440>, 'chain_handler': <function at remote 0x7fffeeb11200>, '__file__': './onboard', 'Onboard': <type at remote 0xf95120>, '__author__': 'Chris Jones <email address hidden>', '__copyright__': 'Copyright © 2009 Chris Jones', '__doc__': None, '__loader__': <SourceFileLoader(path='./onboard', name='__main__') at remote 0x7ffff65f9dd0>, '__package__': None, 'print_function': <_Feature(compiler_flag=65536, optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0)) at remote 0x7ffff65b6150>, 'division': <_Feature(compiler_flag=8192, optional=(2, 2, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0)) at remote 0x7ffff6604bd0>},
    locals=locals@entry={'__name__': '__main__', '__cached__': None, 'sys': <module at remote 0x7ffff7fc3d88>, 'unicode_literals': <_Feature(compiler_flag=131072, optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0)) at remote 0x7ffff65b6190>, '__builtins__': <module at remote 0x7ffff7fb5440>, 'chain_handler': <function at remote 0x7fffeeb11200>, '__file__': './onboard', 'Onboard': <type at remote 0xf95120>, '__author__': 'Chris Jones <email address hidden>', '__copyright__': 'Copyright © 2009 Chris Jones', '__doc__': None, '__loader__': <SourceFileLoader(path='./onboard', name='__main__') at remote 0x7ffff65f9dd0>, '__package__': None, 'print_function': <_Feature(compiler_flag=65536, optional=(2, 6, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0)) at remote 0x7ffff65b6150>, 'division': <_Feature(compiler_flag=8192, optional=(2, 2, 0, 'alpha', 2), mandatory=(3, 0, 0, 'alpha', 0)) at remote 0x7ffff6604bd0>}, closeit=closeit@entry=1, flags=flags@entry=0x7fffffffde50)
    at ../Python/pythonrun.c:1937
#38 0x000000000046310b in PyRun_SimpleFileExFlags (fp=fp@entry=0xacf0d0, filename=<optimized out>, closeit=closeit@entry=1,
    flags=flags@entry=0x7fffffffde50) at ../Python/pythonrun.c:1447
#39 0x0000000000463206 in PyRun_AnyFileExFlags (fp=fp@entry=0xacf0d0, filename=<optimized out>, closeit=closeit@entry=1,
    flags=flags@entry=0x7fffffffde50) at ../Python/pythonrun.c:1169
#40 0x00000000004657b5 in run_file (p_cf=0x7fffffffde50, filename=0x9da290 L"./onboard", fp=0xacf0d0) at ../Modules/main.c:306
#41 Py_Main (argc=argc@entry=2, argv=argv@entry=0x9d9010) at ../Modules/main.c:743
#42 0x000000000047ac58 in main (argc=2, argv=<optimized out>) at ../Modules/python.c:58