[Tickets #7328] fatal error while opening calendar app

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Ticket URL: http://bugs.horde.org/ticket/7328
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  Ticket             | 7328
  Created By         | radim.roska at gmail.com
  Summary            | fatal error while opening calendar app
  Queue              | Kronolith
  Version            | 2.3-RC1
  Type               | Bug
  State              | Unconfirmed
  Priority           | 3. High
  Milestone          |
  Patch              |
  Owners             |
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radim.roska at gmail.com (2008-09-12 09:37) wrote:

turba  H3 (2.1.3)
ingo H3 (1.1.2)
horde 3.3-RC1
lronolith H3 (2.3-RC1)
imp H3 (4.1.3)

newly created database (mysql) = empty. After clicking on cal app in  
menu just black window is showed.

in php.log is the reason

[12-zá&#345;-2008 15:08:24] PHP Notice:  unserialize() [<a  
href='function.unserialize'>function.unserialize</a>]: Error at offset  
0 of 1 bytes in /usr/share/horde3/lib/Horde/Maintenance.php on line 469
[12-zá&#345;-2008 15:08:24] PHP Fatal error:  Call to a member  
function getList() on a non-object in  
/usr/share/horde3/lib/Horde/Maintenance.php on line 517

466     function _retrieveTasklist()
467     {
468         if  
(isset($_SESSION['horde_maintenance_tasklist'][get_class($this)])) {
469             $this->_tasklist =  
unserialize($_SESSION['horde_maintenance_tasklist'][get_class($this)]);
470         } else {
471             $this->_createTaskList();
472         }
473     }

so from some reason - im not php programmer so i dont know why  
:)..tasklist variable is not created in true branch of if.

I've: tried workaroud :)..commented all but line 471 and it works..but  
i suppose thats not best option :)..after restarting apache and  
uncommenting it again..problem is back.

Maybe there is something wrong with my session..then priority should  
be lower...but...

Thanks