tdf#140590 Writer crash in Tools>Chapter Numbering

and an assert in vcl to catch it a little higher up the stack.

Change-Id: Iaa2e70f901f93ca9f678118e4f5a8bc1b6eda20a
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/112459
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
Signed-off-by: Xisco Fauli <xiscofauli@libreoffice.org>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/112866
diff --git a/sw/source/ui/misc/outline.cxx b/sw/source/ui/misc/outline.cxx
index e9b147f..a700488 100644
--- a/sw/source/ui/misc/outline.cxx
+++ b/sw/source/ui/misc/outline.cxx
@@ -92,7 +92,7 @@ void SwNumNamesDlg::SetUserNames(const OUString *pList[])
                nSelect++;
        }
    }
    m_xFormBox->select(nSelect);
    m_xFormBox->select(std::min(nSelect, static_cast<sal_uInt16>(m_xFormBox->n_children() - 1)));
    SelectHdl(*m_xFormBox);
}