Fatal error: PHP notice in file /var/www/www.fotografie.at/lib/page/InfoFotoblogsAddPage.class.php (12): Undefined index: HTTP_REFERER

Information:

error message: PHP notice in file /var/www/www.fotografie.at/lib/page/InfoFotoblogsAddPage.class.php (12): Undefined index: HTTP_REFERER
error code: 0
file: /var/www/www.fotografie.at/wcf/lib/system/WCF.class.php (255)
php version: 5.2.6-1+lenny16
wcf version: 1.0.10 (Horizon)
date: Tue, 24 Jan 2017 17:21:42 +0000
request: /index.php?page=InfoFotoblogsAdd&width=650&height=500&s=b335ec51ecc96fd23586c53a866d78b543270ed7
referer:

Stacktrace:

#0 /var/www/www.fotografie.at/lib/page/InfoFotoblogsAddPage.class.php(12): WCF::handleError(8, 'Undefined index...', '/var/www/www.fo...', 12, Array)
#1 /var/www/www.fotografie.at/wcf/lib/page/AbstractPage.class.php(77): InfoFotoblogsAddPage->assignVariables()
#2 /var/www/www.fotografie.at/lib/page/InfoFotoblogsAddPage.class.php(17): AbstractPage->show()
#3 /var/www/www.fotografie.at/wcf/lib/page/AbstractPage.class.php(36): InfoFotoblogsAddPage->show()
#4 /var/www/www.fotografie.at/wcf/lib/util/RequestHandler.class.php(63): AbstractPage->__construct()
#5 /var/www/www.fotografie.at/wcf/lib/util/RequestHandler.class.php(91): RequestHandler->__construct('InfoFotoblogsAd...', Array, 'page')
#6 /var/www/www.fotografie.at/index.php(8): RequestHandler::handle(Array)
#7 {main}