Fehlermeldung ThreadFormEditButtonListener

Wed, 20 Jul 2016 09:23:31 +0000
Message: PHP notice in file /var/www/html/lib/system/event/listener/ThreadFormEditButtonListener.class.php (22): Trying to get property of non-object
File: /var/www/html/wcf/lib/system/WCF.class.php (309)
PHP version: 5.5.9-1ubuntu4.16
WCF version: 2.1.11 (Typhoon)
Request URI: /index.php/Thread/4098-Kimfri-New-board-member/?postID=41799
Referrer: http://www.du4-gaming.com/index.php/BoardList/
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0
Information: ""
Stacktrace: 
  #0 /var/www/html/lib/system/event/listener/ThreadFormEditButtonListener.class.php(22): wcf\system\WCF::handleError(8, 'Trying to get p...', '/var/www/html/l...', 22, Array)
  #1 /var/www/html/wcf/lib/system/event/EventHandler.class.php(214): wbb\system\event\listener\ThreadFormEditButtonListener->execute(Object(wbb\page\ThreadPage), 'wbb\page\Thread...', 'assignVariables', Array)
  #2 /var/www/html/wcf/lib/page/AbstractPage.class.php(127): wcf\system\event\EventHandler->fireAction(Object(wbb\page\ThreadPage), 'assignVariables')
  #3 /var/www/html/wcf/lib/page/MultipleLinkPage.class.php(219): wcf\page\AbstractPage->assignVariables()
  #4 /var/www/html/lib/page/ThreadPage.class.php(309): wcf\page\MultipleLinkPage->assignVariables()
  #5 /var/www/html/wcf/lib/page/AbstractPage.class.php(276): wbb\page\ThreadPage->assignVariables()
  #6 /var/www/html/wcf/lib/page/AbstractPage.class.php(100): wcf\page\AbstractPage->show()
  #7 /var/www/html/wcf/lib/system/request/Request.class.php(58): wcf\page\AbstractPage->__run()
  #8 /var/www/html/wcf/lib/system/request/RequestHandler.class.php(139): wcf\system\request\Request->execute()
  #9 /var/www/html/index.php(10): wcf\system\request\RequestHandler->handle('wbb')
  #10 {main}