Open attachment 134757 [details] from bug 109251, and save it again (keep format as DOC).
=> Writer crashes.
The first frame is not very useful, but the next one is: WW8Export::WriteFkpPlcUsw()
Crash introduced by:
author Szymon Kłos <email@example.com> 2017-06-19 13:32:16 (GMT)
committer Andras Timar <firstname.lastname@example.org> 2017-06-28 20:38:49 (GMT)
"Watermark: tdf#91687 correct size in the .doc"
author Caolán McNamara <email@example.com> 2017-07-06 14:57:50 (GMT)
committer Caolán McNamara <firstname.lastname@example.org> 2017-07-06 15:20:16 (GMT)
"crashtesting: 554 crashing documents on export to .doc"
Fix was only backported to 5.4 today, so the crash affects 18.104.22.168 & 22.214.171.124 / all OSes.
People might encounter and report this, so I opened a bug report with details in anticipation.