Version:           2.2.1 (using KDE 4.2.1)
OS:                Linux
Installed from:    Debian testing/unstable Packages

Reproduction process:
1) Create two classes
2) Create an association between them, 
3) Double click on them for editing it
4) Click on ok in the new window to save changes.
5) The aplicattion crashes

Debug:
Aplicación: Modelador de UML Umbrello (umbrello), señal SIGSEGV

Thread 1 (Thread 0xb5be8700 (LWP 16496)):
[KCrash Handler]
#6  0x08671fe7 in AssociationWidget::slotRemovePopupMenu (this=0x9157208) at ../../../umbrello/umbrello/associationwidget.cpp:3196
#7  0x0867e910 in AssociationWidget::qt_metacall (this=0x9157208, _c=QMetaObject::InvokeMetaMethod, _id=1, _a=0xbfe9ebe8) at ./associationwidget.moc:77
#8  0xb6a0ebe0 in QMetaObject::activate (sender=0x8f237a8, from_signal_index=53, to_signal_index=53, argv=0x0) at kernel/qobject.cpp:3031
#9  0xb6a0f962 in QMetaObject::activate (sender=0x8f237a8, m=0x87f64e4, local_signal_index=2, argv=0x0) at kernel/qobject.cpp:3101
#10 0x0876de69 in UMLView::sigRemovePopupMenu (this=0x8f237a8) at ./umlview.moc:165
#11 0x08714cb5 in ToolBarState::mousePress (this=0x8ad37e0, ome=0xbfe9ecbc) at ../../../umbrello/umbrello/umlview.h:926
#12 0x0876e70f in UMLView::contentsMousePressEvent (this=0x8f237a8, ome=0xbfe9ecbc) at ../../../umbrello/umbrello/umlview.cpp:1243
#13 0xb6713f61 in Q3ScrollView::viewportMousePressEvent (this=0x8f237a8, e=0xbfe9f24c) at widgets/q3scrollview.cpp:1738
#14 0xb6715b40 in Q3ScrollView::eventFilter (this=0x8f237a8, obj=0x8f1f7a0, e=0xbfe9f24c) at widgets/q3scrollview.cpp:1466
#15 0xb69f92ca in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=0x8a8ec10, receiver=0x8f1f7a0, event=0xbfe9f24c) at kernel/qcoreapplication.cpp:694
#16 0xb6c1a77a in QApplicationPrivate::notify_helper (this=0x8a8ec10, receiver=0x8f1f7a0, e=0xbfe9f24c) at kernel/qapplication.cpp:3799
#17 0xb6c22fd1 in QApplication::notify (this=0xbfe9fa20, receiver=0x8f1f7a0, e=0xbfe9f24c) at kernel/qapplication.cpp:3528
#18 0xb786794d in KApplication::notify (this=0xbfe9fa20, receiver=0x8f1f7a0, event=0xbfe9f24c) at ../../kdeui/kernel/kapplication.cpp:307
#19 0xb69fa0e1 in QCoreApplication::notifyInternal (this=0xbfe9fa20, receiver=0x8f1f7a0, event=0xbfe9f24c) at kernel/qcoreapplication.cpp:587
#20 0xb6c2225e in QApplicationPrivate::sendMouseEvent (receiver=0x8f1f7a0, event=0xbfe9f24c, alienWidget=0x8f1f7a0, nativeWidget=0x8b62f68, buttonDown=0xb73dd670, lastMouseReceiver=@0xb73dd674)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:212
#21 0xb6c8be2d in QETWidget::translateMouseEvent (this=0x8b62f68, event=0xbfe9f73c) at kernel/qapplication_x11.cpp:4044
#22 0xb6c8ac11 in QApplication::x11ProcessEvent (this=0xbfe9fa20, event=0xbfe9f73c) at kernel/qapplication_x11.cpp:3162
#23 0xb6cb463a in x11EventSourceDispatch (s=0x8a91e68, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:142
#24 0xb5e3c718 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#25 0xb5e3fc7b in ?? () from /usr/lib/libglib-2.0.so.0
#26 0x08a90ef8 in ?? ()
#27 0x00000000 in ?? ()