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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - LOCalc Crashes upon file Save"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=139964">139964</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>LOCalc Crashes upon file Save
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>LibreOffice
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>7.0.4.2 release
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows (All)
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>UNCONFIRMED
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Calc
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>libreoffice-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>jack.bauer2359@yahoo.co.uk
          </td>
        </tr></table>
      <p>
        <div>
        <pre>the file operation was a simple File>Save
it crashed about eight times today.  Usually, upon user action File>Save


The Spreadsheet is saved in .xls format. It has  5300 lines  and  columns from
A to AO

I can't supply it, it contains some private information 

it is 90% plaintext, but has some formulae.  Notably about 30 cells of this:

IF(AJ4<$inputs.$B$2,(AJ4-$inputs.$C$1),(IF(AJ4<$inputs.$B$3,(AJ4-$inputs.$C$1-$inputs.$C$2),(IF(AJ4<$inputs.$B$4,(AJ4-$inputs.$C$1-$inputs.$C$2-$inputs.$C$3),(IF(AJ4<$inputs.$B$5,(AJ4-$inputs.$C$1-$inputs.$C$2-$inputs.$C$3-$inputs.$C$4),(IF(AJ4<$inputs.$B$6,(AJ4-$inputs.$C$1-$inputs.$C$2-$inputs.$C$3-$inputs.$C$4-$inputs.$C$5),(AJ4-$inputs.$C$1-$inputs.$C$2-$inputs.$C$3-$inputs.$C$4-$inputs.$C$5-$inputs.$C$6))))))))))

I guess it is RAM related.  I guess that you won't be able to reproduce it. 
THe crash report told me to raise a bugzilla fault 

Intel i5-8250U 1.60GHz 
RAM 8GB, 
W10 Home 64bit v20H2 19042.746</pre>
        </div>
      </p>


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