Avoid crash-reporter crash.

http://crashreport.libreoffice.org/stats/crash_details/f5086a7d-3c67-46e4-945e-e0882a604eee

Change-Id: Ic9ceed2e736a4ad1c155a31d3b2dc453e6a562aa
Reviewed-on: https://gerrit.libreoffice.org/52119
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Meeks <michael.meeks@collabora.com>
diff --git a/sw/source/uibase/utlui/navipi.cxx b/sw/source/uibase/utlui/navipi.cxx
index 69d0f82..fe6f3dd 100644
--- a/sw/source/uibase/utlui/navipi.cxx
+++ b/sw/source/uibase/utlui/navipi.cxx
@@ -945,6 +945,9 @@ IMPL_LINK( SwNavigationPI, MenuSelectHdl, Menu *, pMenu, bool )

void SwNavigationPI::UpdateListBox()
{
    if (isDisposed())
        return;

    m_aDocListBox->SetUpdateMode(false);
    m_aDocListBox->Clear();
    SwView *pActView = GetCreateView();
diff --git a/vcl/source/window/window.cxx b/vcl/source/window/window.cxx
index 73f14f2..2c2ba81 100644
--- a/vcl/source/window/window.cxx
+++ b/vcl/source/window/window.cxx
@@ -2992,15 +2992,20 @@ void Window::Scroll( long nHorzScroll, long nVertScroll,

void Window::Flush()
{

    const tools::Rectangle aWinRect( Point( mnOutOffX, mnOutOffY ), Size( mnOutWidth, mnOutHeight ) );
    mpWindowImpl->mpFrame->Flush( aWinRect );
    if (mpWindowImpl)
    {
        const tools::Rectangle aWinRect( Point( mnOutOffX, mnOutOffY ), Size( mnOutWidth, mnOutHeight ) );
        mpWindowImpl->mpFrame->Flush( aWinRect );
    }
}

void Window::SetUpdateMode( bool bUpdate )
{
    mpWindowImpl->mbNoUpdate = !bUpdate;
    CompatStateChanged( StateChangedType::UpdateMode );
    if (mpWindowImpl)
    {
        mpWindowImpl->mbNoUpdate = !bUpdate;
        CompatStateChanged( StateChangedType::UpdateMode );
    }
}

void Window::GrabFocus()