Resolves: tdf#113336 avoid crash during teardown

Change-Id: Icdebd5aca1a2bdaefb904d153ca97a6cc56ac7ff
Reviewed-on: https://gerrit.libreoffice.org/43712Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sw/source/core/layout/fly.cxx

@@ -1742,9 +1742,13 @@ SwTwips SwFlyFrame::Grow_( SwTwips nDist, bool bTst )
                 {
                     m_bFormatHeightOnly = true;
                 }
-                static_cast<SwFlyFreeFrame*>(this)->SetNoMoveOnCheckClip( true );
-                static_cast<SwFlyFreeFrame*>(this)->SwFlyFreeFrame::MakeAll(getRootFrame()->GetCurrShell()->GetOut());
-                static_cast<SwFlyFreeFrame*>(this)->SetNoMoveOnCheckClip( false );
+                SwViewShell* pSh = getRootFrame()->GetCurrShell();
+                if (pSh)
+                {
+                    static_cast<SwFlyFreeFrame*>(this)->SetNoMoveOnCheckClip( true );
+                    static_cast<SwFlyFreeFrame*>(this)->SwFlyFreeFrame::MakeAll(pSh->GetOut());
+                    static_cast<SwFlyFreeFrame*>(this)->SetNoMoveOnCheckClip( false );
+                }
                 // #i55416#
                 if ( rFrameSz.GetWidthSizeType() != ATT_FIX_SIZE )
                 {