News-System 3.0.0 RC 3 veröffentlicht

sobald ich eine News bearbeite und speichern will kommt = Error Error Type: wcf\system\exception\ErrorException Error Message: array_key_exists(): The first argument should be either a string or an integer File: */lib/system/WCF.class.php (292) Stack Trace: #0 */../../../../[internal function] (?): wcf\system\WCF::handleError(2, 'array_key_exists(): The first argument should be either a string or an integer', '*/lib/system/cache/runtime/AbstractRuntimeCache.class.php', 83, [ objectID => ]) #1 */lib/system/cache/runtime/AbstractRuntimeCache.class.php (83): array_key_exists([ ], [ ]) #2 */news/lib/form/NewsAddForm.class.php (518): wcf\system\cache\runtime\AbstractRuntimeCache->getObject([ ]) #3 */lib/form/AbstractForm.class.php (59): news\form\NewsAddForm->validate() #4 */lib/form/AbstractForm.class.php (112): wcf\form\AbstractForm->submit() #5 */lib/form/AbstractCaptchaForm.class.php (67): wcf\form\AbstractForm->readData() #6 */news/lib/form/NewsEditForm.class.php (92): wcf\form\AbstractCaptchaForm->readData() #7 */lib/page/AbstractPage.class.php (274): news\form\NewsEditForm->readData() #8 */lib/page/AbstractPage.class.php (103): wcf\page\AbstractPage->show() #9 */lib/system/request/Request.class.php (83): wcf\page\AbstractPage->__run() #10 */lib/system/request/RequestHandler.class.php (94): wcf\system\request\Request->execute() #11 */news/index.php (10): wcf\system\request\RequestHandler->handle('news')