This is a cherry-pick of 6374df20.

Credit goes to Isamu Mogi for pin-pointing exactly what caused the crash
and which commit fixed it on master.

Change-Id: Ic5653c76c8c7d8eb8798a9c4ae0cbc43f0e946e4
Reviewed-on: https://gerrit.libreoffice.org/3581Reviewed-by: Eike Rathke <erack@redhat.com>
Reviewed-by: Fridrich Strba <fridrich@documentfoundation.org>
Tested-by: Fridrich Strba <fridrich@documentfoundation.org>