writerfilter: fix crash in DomainMapper_Impl::handleIndex()

Crashreport signature:

program/libwriterfilterlo.so
      writerfilter::dmapper::DomainMapper_Impl::handleIndex(tools::SvRef<writerfilter::dmapper::FieldContext> const&, rtl::OUString const&)
              writerfilter/source/dmapper/DomainMapper_Impl.cxx:6116
program/libwriterfilterlo.so
      writerfilter::dmapper::DomainMapper_Impl::CloseFieldCommand()
              include/rtl/ustring.hxx:527
program/libwriterfilterlo.so
      writerfilter::dmapper::DomainMapper::lcl_text(unsigned char const*, unsigned long)
              writerfilter/source/dmapper/DomainMapper.cxx:3735
program/libwriterfilterlo.so
      writerfilter::rtftok::RTFDocumentImpl::singleChar(unsigned char, bool)
              writerfilter/source/rtftok/rtfdocumentimpl.hxx:718

Change-Id: I4e0f93ce50c8c9a1f9a1a0f9204bd4fee70cdde4
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/151502
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins

1 files changed, 4 insertions, 1 deletions

diff --git a/writerfilter/source/dmapper/DomainMapper_Impl.cxx b/writerfilter/source/dmapper/DomainMapper_Impl.cxx
index b3942b4654e9..83ce570dcbab 100644
--- a/writerfilter/source/dmapper/DomainMapper_Impl.cxx
+++ b/writerfilter/source/dmapper/DomainMapper_Impl.cxx
@@ -6800,7 +6800,10 @@ void DomainMapper_Impl::handleIndex
     {
         sValue = sValue.replaceAll("\"", "");
         uno::Reference<text::XTextColumns> xTextColumns;
-        xTOC->getPropertyValue(getPropertyName( PROP_TEXT_COLUMNS )) >>= xTextColumns;
+        if (xTOC.is())
+        {
+            xTOC->getPropertyValue(getPropertyName( PROP_TEXT_COLUMNS )) >>= xTextColumns;
+        }
         if (xTextColumns.is())
         {
             xTextColumns->setColumnCount( sValue.toInt32() );