tdf#115086 crash in assignLabelsToDataSequence

since...

commit c45358e9
Date:   Mon Apr 24 00:09:08 2017 +0200

    preserve "Total" label on round-trip, remove code duplication

Change-Id: I83ed20e1cab8d67f2f5aedcaf862756d9548bf9f
Reviewed-on: https://gerrit.libreoffice.org/59060
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sc/source/ui/unoobj/PivotTableDataProvider.cxx

@@ -618,7 +618,7 @@ PivotTableDataProvider::assignLabelsToDataSequence(size_t nIndex)
     {
         aLabel = ScResId(STR_PIVOT_TOTAL);
     }
-    else
+    else if (nIndex < m_aLabels.size())
     {
         for (ValueAndFormat const & rItem : m_aLabels[nIndex])
         {