Can't open file saved in writer?

After adding an email link with embedded subject to some files I can no longer open them with Writer. When I try I get a SAX parse error:

SAXParseException: '[word/document.xml line 2]: Opening and ending tag mismatch: hyperlink line 0 and sdtContent', Stream 'word/document.xml', Line 2, Column 1308(row,col).
  • Version:
  • Build ID:644e4637d1d8544fd9f56425bd6cec110e49301b
  • CPU Threads: 4; OS Version: Windows
  • 6.2; UI Render: default; Locale: en-US (en_US)

Additional: Saving to odt format and then saving back to docx fixes the problem. You must do this before closing the document of course because you will not be able to re-open it.