Fatal error: PHP notice in file /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/security/SecurityHandler.class.php (342): Array to string conversion

Information:

error message: PHP notice in file /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/security/SecurityHandler.class.php (342): Array to string conversion
error code: 0
file: /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/WCF.class.php (255)
php version: 5.5.38-he.1
wcf version: 1.0.11 pl 3 (Horizon)
date: Sat, 27 Aug 2016 13:24:22 +0000
request: /index.php
referer:

Stacktrace:

#0 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/security/SecurityHandler.class.php(342): WCF::handleError(8, 'Array to string...', '/is/htdocs/wp11...', 342, Array)
#1 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/security/SecurityHandler.class.php(278): SecurityHandler->generateJournal('flood')
#2 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/security/SecurityHandler.class.php(256): SecurityHandler->attackJournal('flood')
#3 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/security/plugins/blacklist/blacklist.class.php(53): SecurityHandler->accessDenied('flood', Array)
#4 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/security/plugins/blacklist/blacklist.class.php(21): Blacklist->handleList()
#5 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/security/SecurityHandler.class.php(192): Blacklist->execute(Object(SecurityHandler), 'blacklist')
#6 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/security/SecurityHandler.class.php(56): SecurityHandler->fireActions()
#7 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/event/listener/SecurityListener.class.php(34): SecurityHandler->systemCore()
#8 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/event/EventHandler.class.php(117): SecurityListener->execute(Object(IndexPage), 'IndexPage', 'readParameters')
#9 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/system/event/EventHandler.class.php(142): EventHandler::executeInheritedActions(Object(IndexPage), 'readParameters', 'IndexPage', 'readParameters@...')
#10 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/page/AbstractPage.class.php(44): EventHandler::fireAction(Object(IndexPage), 'readParameters')
#11 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/page/AbstractPage.class.php(35): AbstractPage->readParameters()
#12 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/util/RequestHandler.class.php(63): AbstractPage->__construct()
#13 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/wcf/lib/util/RequestHandler.class.php(100): RequestHandler->__construct('Index', Array, 'page')
#14 /is/htdocs/wp1132509_S572PKJP7A/www/forum/wbb2/index.php(8): RequestHandler::handle(Array)
#15 {main}