Suddenly the synchronization with the ownCloud calendar stopped working. It gave me a strange message in the logs:

{“reqId”:”epU4rqrz1maFuP9hBxmu”,”remoteAddr”:”127.0.0.1″,”app”:”calendar”,”message”:”Event (20150807T141714Z-27435_7a94261e27f2b60.ics) contains invalid data: End of document reached prematurely”,”level”:2,”time”:”2015-09-03T06:00:26+00:00″}

The interesting part here is the error message that says “Event contains invalid data: End of document reached prematurely”. Looking around I found out that there are some reports of broken VCalendar events stored in the database. So, using the mighty SQL statement

mysql -u owncloud -p ownclouddb -e “SELECT * FROM oc_clndr_objects WHERE calendardata NOT LIKE ‘%END:VCALENDAR%’;”

I found that the database contains 218 events without a closing END:VCALENDAR statement. All of the events were for the same event that I created recently mercilessly duplicated. And the event was not showing on the calendar, of course.

As soon as I deleted all of those broken entries from the database, everything came back to normal. Sync works again. My guess for the reason? Graphical smileys in the title. Try to stick to the pure ASCII there next time, I guess.… -->