Version:            (using Devel)
OS:                Linux
Installed from:    Compiled sources

I just start nightly neon kde on ubuntu and when I've added the task manager widget (I've removed before but it was a mistake) plasma restart opening the "plasma workspace - The KDE crash Handler" window.

Here is the report :

Application: Plasma Workspace (plasma), signal SIGSEGV
[Current thread is 0 (LWP 14120)]

Thread 3 (Thread 0xa9550b90 (LWP 14121)):
#0  0xb7f9e430 in __kernel_vsyscall ()
#1  0xb682c075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6891b6e in QWaitCondition::wait () from /opt/project-neon/lib/libQtCore.so.4
#3  0xa97fde90 in ?? () from /opt/kde-nightly/lib/kde4/plasma_wallpaper_image.so
#4  0xb6890f90 in ?? () from /opt/project-neon/lib/libQtCore.so.4
#5  0xb682850f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb66807ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa8ca8b90 (LWP 14122)):
#0  0xb7f9e430 in __kernel_vsyscall ()
#1  0xb682c075 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb6891b6e in QWaitCondition::wait () from /opt/project-neon/lib/libQtCore.so.4
#3  0xb7a04802 in ?? () from /opt/project-neon/lib/libQtNetwork.so.4
#4  0xb6890f90 in ?? () from /opt/project-neon/lib/libQtCore.so.4
#5  0xb682850f in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#6  0xb66807ee in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb4aa76e0 (LWP 14120)):
[KCrash Handler]
#6  0x0966b41b in ?? ()
#7  0xb7e04c13 in Plasma::Applet::focusInEvent () from /opt/kde-nightly/lib/libplasma.so.3
#8  0xb711af7f in QGraphicsItem::sceneEvent () from /opt/project-neon/lib/libQtGui.so.4
#9  0xb715a33f in QGraphicsWidget::sceneEvent () from /opt/project-neon/lib/libQtGui.so.4
#10 0xb713681c in ?? () from /opt/project-neon/lib/libQtGui.so.4
#11 0xb713695b in QGraphicsScene::setFocusItem () from /opt/project-neon/lib/libQtGui.so.4
#12 0xb7140376 in ?? () from /opt/project-neon/lib/libQtGui.so.4
#13 0xb713a90f in QGraphicsScene::event () from /opt/project-neon/lib/libQtGui.so.4
#14 0xb6bb76ec in QApplicationPrivate::notify_helper () from /opt/project-neon/lib/libQtGui.so.4
#15 0xb6bbea9f in QApplication::notify () from /opt/project-neon/lib/libQtGui.so.4
#16 0xb77c32c3 in KApplication::notify () from /opt/kde-nightly/lib/libkdeui.so.5
#17 0xb697c5a1 in QCoreApplication::notifyInternal () from /opt/project-neon/lib/libQtCore.so.4
#18 0xb714b579 in QGraphicsView::mousePressEvent () from /opt/project-neon/lib/libQtGui.so.4
#19 0xb6c1004a in QWidget::event () from /opt/project-neon/lib/libQtGui.so.4
#20 0xb6f3e6f3 in QFrame::event () from /opt/project-neon/lib/libQtGui.so.4
#21 0xb6fce97f in QAbstractScrollArea::viewportEvent () from /opt/project-neon/lib/libQtGui.so.4
#22 0xb714d92f in QGraphicsView::viewportEvent () from /opt/project-neon/lib/libQtGui.so.4
#23 0xb6fd0da5 in ?? () from /opt/project-neon/lib/libQtGui.so.4
#24 0xb697bf7a in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /opt/project-neon/lib/libQtCore.so.4
#25 0xb6bb76ca in QApplicationPrivate::notify_helper () from /opt/project-neon/lib/libQtGui.so.4
#26 0xb6bbf427 in QApplication::notify () from /opt/project-neon/lib/libQtGui.so.4
#27 0xb77c32c3 in KApplication::notify () from /opt/kde-nightly/lib/libkdeui.so.5
#28 0xb697c5a1 in QCoreApplication::notifyInternal () from /opt/project-neon/lib/libQtCore.so.4
#29 0xb6bbe66a in QApplicationPrivate::sendMouseEvent () from /opt/project-neon/lib/libQtGui.so.4
#30 0xb6c25010 in ?? () from /opt/project-neon/lib/libQtGui.so.4
#31 0xb6c2404b in QApplication::x11ProcessEvent () from /opt/project-neon/lib/libQtGui.so.4
#32 0xb6c4bc0a in ?? () from /opt/project-neon/lib/libQtGui.so.4
#33 0xb5b296f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#34 0xb5b2cda3 in ?? () from /usr/lib/libglib-2.0.so.0
#35 0xb5b2cf61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#36 0xb69a5eb8 in QEventDispatcherGlib::processEvents () from /opt/project-neon/lib/libQtCore.so.4
#37 0xb6c4b315 in ?? () from /opt/project-neon/lib/libQtGui.so.4
#38 0xb697afaa in QEventLoop::processEvents () from /opt/project-neon/lib/libQtCore.so.4
#39 0xb697b16a in QEventLoop::exec () from /opt/project-neon/lib/libQtCore.so.4
#40 0xb698020d in QCoreApplication::exec () from /opt/project-neon/lib/libQtCore.so.4
#41 0xb6bb7417 in QApplication::exec () from /opt/project-neon/lib/libQtGui.so.4
#42 0xb7f48b77 in kdemain () from /opt/kde-nightly/lib/libkdeinit4_plasma.so
#43 0x08048792 in _start ()