Fatal error: PHP error in file /www/htdocs/v084149/crohn-forum/lib/data/thread/ViewableThreadAbsenceDecorator.class.php (23): Declaration of ViewableThreadAbsenceDecorator::canReplyThread() should be compatible with Thread::canReplyThread($board = NULL)

Information:

error message: PHP error in file /www/htdocs/v084149/crohn-forum/lib/data/thread/ViewableThreadAbsenceDecorator.class.php (23): Declaration of ViewableThreadAbsenceDecorator::canReplyThread() should be compatible with Thread::canReplyThread($board = NULL)
error code: 0
file: /www/htdocs/v084149/crohn-forum/wcf/lib/system/WCF.class.php (255)
php version: 5.5.38-nmm2
wcf version: 1.0.11 pl 3 (Horizon)
date: Wed, 24 May 2017 15:32:31 +0000
request: /crohn-forum/index.php?page=Thread&postID=431655
referer:

Stacktrace:

#0 /www/htdocs/v084149/crohn-forum/lib/system/event/listener/ThreadPageUserAbsenceListener.class.php(3): WCF::handleError(2048, 'Declaration of ...', '/www/htdocs/v08...', 23, Array)
#1 /www/htdocs/v084149/crohn-forum/lib/system/event/listener/ThreadPageUserAbsenceListener.class.php(3): require_once()
#2 /www/htdocs/v084149/crohn-forum/wcf/lib/system/event/EventHandler.class.php(175): require_once('/www/htdocs/v08...')
#3 /www/htdocs/v084149/crohn-forum/wcf/lib/page/AbstractPage.class.php(63): EventHandler::fireAction(Object(ThreadPage), 'assignVariables')
#4 /www/htdocs/v084149/crohn-forum/wcf/lib/page/MultipleLinkPage.class.php(109): AbstractPage->assignVariables()
#5 /www/htdocs/v084149/crohn-forum/lib/page/ThreadPage.class.php(132): MultipleLinkPage->assignVariables()
#6 /www/htdocs/v084149/crohn-forum/wcf/lib/page/AbstractPage.class.php(77): ThreadPage->assignVariables()
#7 /www/htdocs/v084149/crohn-forum/wcf/lib/page/AbstractPage.class.php(36): AbstractPage->show()
#8 /www/htdocs/v084149/crohn-forum/wcf/lib/util/RequestHandler.class.php(63): AbstractPage->__construct()
#9 /www/htdocs/v084149/crohn-forum/wcf/lib/util/RequestHandler.class.php(91): RequestHandler->__construct('Thread', Array, 'page')
#10 /www/htdocs/v084149/crohn-forum/index.php(8): RequestHandler::handle(Array)
#11 {main}