This is due to a regression in libical version 3.0.15. It is fixed in libical 3.0.16 (which is in unstable). See https://bugs.kde.org/show_bug.cgi? id=460442.
-- David Jarvie. KDE developer, KAlarm author.
- Bug#1021938: kalarm: .local/share/kalarm/expired.ics is ... ael
- Bug#1021938: kalarm: .local/share/kalarm/expired.ic... Igor A. Shmakov
- Bug#1021938: kalarm: .local/share/kalarm/expired.ic... David Jarvie
- Bug#1021938: libical bug ael
- Bug#1021938: reassign Bug#1021938: libical bug Aurélien COUDERC
