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The following notes should help you.

Invalid customergroup in /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/engine/Shopware/Controllers/Frontend/Register.php on line 459

Stack trace:

#0 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/engine/Shopware/Controllers/Frontend/Register.php(484): Shopware_Controllers_Frontend_Register->getCustomerGroupKey()
#1 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/engine/Shopware/Controllers/Frontend/Register.php(83): Shopware_Controllers_Frontend_Register->getRegisterData()
#2 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/engine/Library/Enlight/Controller/Action.php(182): Shopware_Controllers_Frontend_Register->indexAction()
#3 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/engine/Library/Enlight/Controller/Dispatcher/Default.php(461): Enlight_Controller_Action->dispatch('indexAction')
#4 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/engine/Library/Enlight/Controller/Front.php(225): Enlight_Controller_Dispatcher_Default->dispatch(Object(Enlight_Controller_Request_RequestHttp), Object(Enlight_Controller_Response_ResponseHttp))
#5 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/engine/Shopware/Kernel.php(197): Enlight_Controller_Front->dispatch()
#6 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/vendor/symfony/http-kernel/HttpCache/SubRequestHandler.php(85): Shopware\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#7 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/vendor/symfony/http-kernel/HttpCache/HttpCache.php(479): Symfony\Component\HttpKernel\HttpCache\SubRequestHandler::handle(Object(Shopware\Kernel), Object(Symfony\Component\HttpFoundation\Request), 1, true)
#8 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/engine/Shopware/Components/HttpCache/AppCache.php(262): Symfony\Component\HttpKernel\HttpCache\HttpCache->forward(Object(Symfony\Component\HttpFoundation\Request), true, NULL)
#9 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/vendor/symfony/http-kernel/HttpCache/HttpCache.php(452): Shopware\Components\HttpCache\AppCache->forward(Object(Symfony\Component\HttpFoundation\Request), true)
#10 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/vendor/symfony/http-kernel/HttpCache/HttpCache.php(346): Symfony\Component\HttpKernel\HttpCache\HttpCache->fetch(Object(Symfony\Component\HttpFoundation\Request), true)
#11 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/engine/Shopware/Components/HttpCache/AppCache.php(189): Symfony\Component\HttpKernel\HttpCache\HttpCache->lookup(Object(Symfony\Component\HttpFoundation\Request), true)
#12 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/vendor/symfony/http-kernel/HttpCache/HttpCache.php(224): Shopware\Components\HttpCache\AppCache->lookup(Object(Symfony\Component\HttpFoundation\Request), true)
#13 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/engine/Shopware/Components/HttpCache/AppCache.php(114): Symfony\Component\HttpKernel\HttpCache\HttpCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#14 /home_pr6/r/o/roflex.ch/htdocs/shop.roflex.ch/shopware.php(122): Shopware\Components\HttpCache\AppCache->handle(Object(Symfony\Component\HttpFoundation\Request))
#15 {main}