Could not execute prepared statement

Wed, 29 May 2013 18:51:36 +0200
Message: Could not execute prepared statement: SQLSTATE[22001]: String data, right truncated: 1406 Data too long for column 'requestMethod' at row 1
File: /www/htdocs/w00f3edf/GCBeta/wcf/lib/system/database/statement/PreparedStatement.class.php (100)
PHP version: 5.3.18-nmm1
WCF version: 2.0.0 Beta 1 (Maelstrom)
Request URI: /index.php/AJAXProxy/?
Referrer:
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:21.0) Gecko/20100101 Firefox/21.0
Stacktrace:
#0 /www/htdocs/w00f3edf/GCBeta/wcf/lib/data/DatabaseObjectEditor.class.php(38): wcf\system\database\statement\PreparedStatement->execute(Array)
#1 /www/htdocs/w00f3edf/GCBeta/wcf/lib/data/acp/session/ACPSessionEditor.class.php(31): wcf\data\DatabaseObjectEditor::create(Array)
#2 [internal function]: wcf\data\acp\session\ACPSessionEditor::create(Array)
#3 /www/htdocs/w00f3edf/GCBeta/wcf/lib/system/session/SessionHandler.class.php(375): call_user_func(Array, Array)
#4 /www/htdocs/w00f3edf/GCBeta/wcf/lib/system/session/SessionHandler.class.php(136): wcf\system\session\SessionHandler->create()
#5 /www/htdocs/w00f3edf/GCBeta/wcf/lib/system/session/ACPSessionFactory.class.php(28): wcf\system\session\SessionHandler->load('wcf\data\sessio...', '')
#6 /www/htdocs/w00f3edf/GCBeta/wcf/lib/system/WCF.class.php(317): wcf\system\session\ACPSessionFactory->load()
#7 /www/htdocs/w00f3edf/GCBeta/wcf/lib/system/WCF.class.php(122): wcf\system\WCF->initSession()
#8 /www/htdocs/w00f3edf/GCBeta/wcf/global.php(14): wcf\system\WCF->__construct()
#9 /www/htdocs/w00f3edf/GCBeta/global.php(16): require_once('/www/htdocs/w00...')
#10 /www/htdocs/w00f3edf/GCBeta/index.php(9): require_once('/www/htdocs/w00...')
#11 {main}