valarm entry in Calendar causing problems

[Crummy, John]

Hello,

I have been having issues with my calendar recently that did not affect 
any other users. The symptoms from a user's perspective were that no 
calendar entries would display in Roundcube, and I was unable to sync 
using my CalDAV client on my Android phone. Adding calendar items seemed 
to work, but again, they would never be shown in the calendar view, so 
they effectively just disappeared.

Logging on to the server, I was able to verify that calendar items were 
indeed being added to the imap Calendar folder in my user mailbox. I 
checked the apache error logs and found the following entry whenever I 
refreshed the calendar in Roundcube:

[Mon Jan 11 23:54:10 2016] [error] [client 24.86.198.190] PHP Fatal 
error:  Call to undefined method Attendee::email() in 
/usr/share/roundcubemail/plugins/libkolab/lib/kolab_format_xcal.php on 
line 243, referer: https://mail.minable.ca/roundcubemail/?_task=calendar

Taking a look at the kolab_format_xcal.php file, it was indeed looking 
for the email() method that it couldn't find, but this was associated 
with a valarm of type EMAIL. I don't know much about iCal, but I did a 
quick grep search for EMAIL in any files in my Calendar folder, and I 
found a single entry that included that reference. I've attached that 
file here. (I've modified that file slightly to obscure my wife's and 
friend's name and email address, otherwise I left it as-is).

Starting at line 143-166 is the offending valarm entry, which I believe 
my wife added to remind me not to miss the show! I removed that valarm 
entry, and everything works great now.

The reason I'm sending this is to see if this is expected/desired 
behaviour. I looks like the kolab_format_xcal.php script is designed to 
handle that entry, but something else is missing.

Could someone shed some light on this, or is this a bug?

Thank you,

-- 
-John
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