Comment 2 for bug 747439

StacktraceTop:
 CompWindow::id (this=0x0) at /build/buildd/compiz-0.9.4git20110322/src/window.cpp:4467
 CompScreen::handleEvent (this=0x956a4b8, event=0xbfcd778c) at /build/buildd/compiz-0.9.4git20110322/src/event.cpp:1292
 PrivateCompositeScreen::handleEvent (this=0x95c16b0, event=0xbfcd778c) at /build/buildd/compiz-0.9.4git20110322/plugins/composite/src/screen.cpp:102
 CompScreen::handleEvent (this=0x956a4b8, event=0xbfcd778c) at /build/buildd/compiz-0.9.4git20110322/src/event.cpp:986
 PrivateGLScreen::handleEvent (this=0x95c4580, event=0xbfcd778c) at /build/buildd/compiz-0.9.4git20110322/plugins/opengl/src/screen.cpp:588