[kronolith] invite.php fatal error.

[Edwin Culp]

With the head version of kronolith, I decided to test "invite" 
for a meeting and got the following error.

PHP Fatal error:  Call to a member function on a non-object in
/usr/local/www/data/horde/kronolith/invite.php on line 65

which is 

$headers['Subject'] = sprintf(_("You have been invited to %s"), $event->getTitle());

I don't remember using invite with shared calendars so I may have missed
something. 

Thanks,

ed

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