Da ist wohl etwas schief gelaufen!

ErrorException: Undefined index: key in /var/www/eradstore/app/dxmp/lib/Dx/Mp/Web/Offer.php:196
Stack trace:
#0 /var/www/eradstore/app/dxmp/lib/Dx/Mp/Web/Offer.php(196): exception_error_handler(8, 'Undefined index...', '/var/www/eradst...', 196, Array)
#1 /var/www/eradstore/app/dxmp/lib/Dx/Kj/Product/ProductAbstract.php(160): Dx_Mp_Web_Offer->getValue('brand_key')
#2 /var/www/eradstore/app/dxmp/lib/Dx/Mp/Web/Radstore/Helper.php(480): Dx_Kj_Product_ProductAbstract->getBrandKey()
#3 /var/www/eradstore/app/dxmp/lib/Dx/Mp/Web/Radstore/Offer.php(74): Dx_Mp_Web_Radstore_Helper->getOfferData(Object(Dx_Mp_Web_Offer))
#4 /var/www/eradstore/app/dxmp/lib/Dx/Mp/Web/Radstore/Offer.php(150): Dx_Mp_Web_Radstore_Offer->makeRelatedOfferList()
#5 /var/www/eradstore/app/dxmp/lib/Dx/Mp/Web/Radstore/Offer.php(190): Dx_Mp_Web_Radstore_Offer->getOfferContent(Array)
#6 /var/www/eradstore/app/dxmp/lib/Dx/Mp/Web/Site.php(812): Dx_Mp_Web_Radstore_Offer->getContent()
#7 /var/www/eradstore/app/dxmp/web/eradstore/index.php(29): Dx_Mp_Web_Site->showContent()
#8 {main}