This should prevent the crash - at least it did for me AFAICS.

Change-Id: I489264d8054e6577b948b0ab307c863d3140788a
Reviewed-on: https://gerrit.libreoffice.org/70755
Tested-by: Jenkins
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>
(cherry picked from commit 9f392d0c)