RobotIKGui crashes on widget close

The roboIK gui crashed during closing with the following backtrace:

[6497][18:21:18.129][ArmarXGui][Application::HandlerFault(int)]: Error: Segmentation Fault
Backtrace:

Backtrace:
1       0x7fe16ba8c338 armarx::Application::HandlerFault(int) + 188
2       0x7fe16a64ad40 /lib/x86_64-linux-gnu/libc.so.6(+0x36d40) [0x7fe16a64ad40]
3       0x7fe0e0139028 IceInternal::ProxyHandle<IceProxy::armarx::RobotStateComponentInterface>::ProxyHandle(IceInternal::ProxyHandle<IceProxy::armarx::RobotStateComponentInterface> const&) + 76
4       0x7fe0e012e189 armarx::RobotIKWidgetController::robotUpdateTimerCB(void*, SoSensor*) + 121
5       0x7fe167a6a6e2 SoSensorManager::processTimerQueue() + 322
6       0x7fe1672e2c81 SoQtP::slot_idleSensor() + 17
7       0x7fe1681e587a QMetaObject::activate(QObject*, QMetaObject const*, int, void**) + 730
8       0x7fe1681e9a31 QObject::event(QEvent*) + 97
9       0x7fe168702e2c QApplicationPrivate::notify_helper(QObject*, QEvent*) + 140
10      0x7fe1687094a0 QApplication::notify(QObject*, QEvent*) + 624
11      0x7fe16b5a3f81 armarx::ArmarXQApplication::notify(QObject*, QEvent*) + 65
12      0x7fe1681d14dd QCoreApplication::notifyInternal(QObject*, QEvent*) + 109
13      0x7fe168201323 /usr/lib/x86_64-linux-gnu/libQtCore.so.4(+0x1ad323) [0x7fe168201323]
14      0x7fe1681fe5f1 /usr/lib/x86_64-linux-gnu/libQtCore.so.4(+0x1aa5f1) [0x7fe1681fe5f1]
15      0x7fe1659dee04 g_main_context_dispatch + 596
16      0x7fe1659df048 /lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x49048) [0x7fe1659df048]
17      0x7fe1659df0ec g_main_context_iteration + 44
18      0x7fe1681fe7a1 QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 113
19      0x7fe1687a4be6 /usr/lib/x86_64-linux-gnu/libQtGui.so.4(+0x26bbe6) [0x7fe1687a4be6]
20      0x7fe1681d00af QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 47
21      0x7fe1681d03a5 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 373
22      0x7fe1681d5b79 QCoreApplication::exec() + 137
23      0x7fe16b5a3d89 armarx::ArmarXGuiApp::exec(IceUtil::Handle<armarx::ArmarXManager> const&) + 243
24      0x7fe16ba8d9b4 armarx::Application::run(int, char**) + 3426
25      0x7fe16d169b7d Ice::Application::doMain(int, char**, Ice::InitializationData const&) + 381
26      0x7fe16ba8ed12 armarx::Application::doMain(int, char**, Ice::InitializationData const&) + 350
27      0x7fe16d15856b Ice::Application::main(int, char**, Ice::InitializationData const&) + 795
28            0x40bac9 main + 444
29      0x7fe16a635ec5 __libc_start_main + 245
30            0x40b849 /homes/staff/waechter/armarx/ArmarXGui/build/bin/ArmarXGuiRun() [0x40b849]