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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 - FILEOPEN XLSX Crash when header is set & Jumbo tables enabled"
   href="https://bugs.documentfoundation.org/show_bug.cgi?id=134461">134461</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>FILEOPEN XLSX Crash when header is set & Jumbo tables enabled
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>7.1.0.0.alpha0+ Master
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

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

        <tr>
          <th>Keywords</th>
          <td>filter:xlsx
          </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>libreoffice@nisz.hu
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>nemeth@numbertext.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="http://bugs.documentfoundation.org/attachment.cgi?id=162596" name="attach_162596" title="Screenshot of the problem in Calc">attachment 162596</a> <a href="http://bugs.documentfoundation.org/attachment.cgi?id=162596&action=edit" title="Screenshot of the problem in Calc">[details]</a></span>
Screenshot of the problem in Calc

<span class=""><a href="http://bugs.documentfoundation.org/attachment.cgi?id=162592" name="attach_162592" title="Example file from Calc">Attachment #162592</a> <a href="http://bugs.documentfoundation.org/attachment.cgi?id=162592&action=edit" title="Example file from Calc">[details]</a></span> from <a class="bz_bug_link 
          bz_status_UNCONFIRMED "
   title="UNCONFIRMED - FILESAVE XLSX Header character formatting partially saved"
   href="show_bug.cgi?id=134316">bug #134316</a> is a simple empty Calc table with header
set.
<span class=""><a href="http://bugs.documentfoundation.org/attachment.cgi?id=162593" name="attach_162593" title="The original file saved by Calc to xlsx">Attachment #162593</a> <a href="http://bugs.documentfoundation.org/attachment.cgi?id=162593&action=edit" title="The original file saved by Calc to xlsx">[details]</a></span> is the same file saved as xlsx.
If Tools – Options – Calc – Defaults – Enable very large spreadsheets is
enabled (without this the crash does not happen):
* Going to Print preview of the XLSX version shows the preview with No Data –
this is fine.
* Typing any data to the sheet, like “a” to A1 and going to Print preview /
trying to print crashes Calc with this on the console:

LibreOfficeDev 7.0 - Fatal Error: multi_type_vector::position#1750: block
position not found! (logical pos=1048600, block size=2, logical size=1048576)

Steps to reproduce:
    1. Tools – Options – Calc – Defaults – Enable very large spreadsheets
    2. Open <span class=""><a href="http://bugs.documentfoundation.org/attachment.cgi?id=162593" name="attach_162593" title="The original file saved by Calc to xlsx">Attachment #162593</a> <a href="http://bugs.documentfoundation.org/attachment.cgi?id=162593&action=edit" title="The original file saved by Calc to xlsx">[details]</a></span>
    3. Type something to the sheet, go to Print preview or Print

Actual results:
Crash.

Expected results:
No crash.

LibreOffice details:
Version: 7.1.0.0.alpha0+ (x64)
Build ID: acbe57481e0a10be287aad59201873a0799a94f0
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: Skia/Raster; VCL: win
Locale: hu-HU (hu_HU); UI: en-US
Calc: CL</pre>
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