Fehlermeldung Invalide Customergroup

Kennt jemand diesen Fehler im Logfile unter Core_production?
Was hat es damit auf sich?? Er taucht in unregelmäßigen Abständen im Logfile immer wieder bei uns auf. In welcher Richtung muss ich da suchen bzw. was bedeutet die Fehlermeldung genau?

Enlight_Exception: Invalid customergroup in /engine/Shopware/Controllers/Frontend/Register.php:459 Stack trace:
#0 /engine/Shopware/Controllers/Frontend/Register.php(484): Shopware_Controllers_Frontend_Register->getCustomerGroupKey()
#1 /engine/Shopware/Controllers/Frontend/Register.php(81): Shopware_Controllers_Frontend_Register->getRegisterData()
#2 /engine/Library/Enlight/Controller/Action.php(192): Shopware_Controllers_Frontend_Register->indexAction()
#3 /engine/Library/Enlight/Controller/Dispatcher/Default.php(478): Enlight_Controller_Action->dispatch(‚indexAction‘)
#4 /engine/Library/Enlight/Controller/Front.php(228): Enlight_Controller_Dispatcher_Default->dispatch(Object(Enlight_Controller_Request_RequestHttp), Object(Enlight_Controller_Response_ResponseHttp))
#5 /engine/Shopware/Kernel.php(188): Enlight_Controller_Front->dispatch()
#6 /vendor/symfony/http-kernel/HttpCache/SubRequestHandler.php(102): Shopware\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#7 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(453): Symfony\Component\HttpKernel\HttpCache\SubRequestHandler::handle(Object(Shopware\Kernel), Object(Symfony\Component\HttpFoundation\Request), 1, true)
#8 /engine/Shopware/Components/HttpCache/AppCache.php(261): Symfony\Component\HttpKernel\HttpCache\HttpCache->forward(Object(Symfony\Component\HttpFoundation\Request), true, NULL)
#9 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(426): Shopware\Components\HttpCache\AppCache->forward(Object(Symfony\Component\HttpFoundation\Request), true)
#10 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(317): Symfony\Component\HttpKernel\HttpCache\HttpCache->fetch(Object(Symfony\Component\HttpFoundation\Request), true)
#11 /engine/Shopware/Components/HttpCache/AppCache.php(188): Symfony\Component\HttpKernel\HttpCache\HttpCache->lookup(Object(Symfony\Component\HttpFoundation\Request), true)
#12 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(192): Shopware\Components\HttpCache\AppCache->lookup(Object(Symfony\Component\HttpFoundation\Request), true)
#13 /engine/Shopware/Components/HttpCache/AppCache.php(113): Symfony\Component\HttpKernel\HttpCache\HttpCache->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true)
#14 /html/shopware/shopware.php(122): Shopware\Components\HttpCache\AppCache->handle(Object(Symfony\Component\HttpFoundation\Request))
#15

Kunde wurde einer Kundengruppe zugeordnet, die gelöscht wurde?

Das ist merkwürdig…Aber danke für den Hinweis. Kann ich mir aber beim besten Willen nicht erklären.

Invalid customer groupkey passed via direct URL or api.

Example :
Available groupkey : http://192.168.2.106/shopware/register/index/sValidation/EK
→ Working.
Not Available groupkey : http://192.168.2.106/shopware/register/index/sValidation/EKTS
→ Not Working and throw exception.

check this.