Fehlermeldung seitens des Kunden bei Bestellung

Schönen guten Morgen!

Seitens des Kunden kommt eine Fehlermeldung im letzten Schritt der Bestellung. Kann hier jemand vielleicht helfen? Shopware 5.5.1.

Enlight_Controller_Exception: Unauthorized in /engine/Shopware/Plugins/Default/Backend/Auth/Bootstrap.php:207  Stack trace:

#0 /engine/Library/Enlight/Event/Handler/Plugin.php(149): Shopware_Plugins_Backend_Auth_Bootstrap->onPreDispatchBackend(Object(Enlight_Controller_ActionEventArgs))

#1 /engine/Library/Enlight/Event/EventManager.php(220): Enlight_Event_Handler_Plugin->execute(Object(Enlight_Controller_ActionEventArgs))

#2 /engine/Library/Enlight/Controller/Action.php(171): Enlight_Event_EventManager->notify(‘Enlight_Control…’, Object(Enlight_Controller_ActionEventArgs))

#3 /engine/Library/Enlight/Controller/Dispatcher/Default.php(549): Enlight_Controller_Action->dispatch(‘checkBenchmarks…’)

#4 /engine/Library/Enlight/Controller/Front.php(222): Enlight_Controller_Dispatcher_Default->dispatch(Object(Enlight_Controller_Request_RequestHttp), Object(Enlight_Controller_Response_ResponseHttp))

#5 /engine/Shopware/Kernel.php(202): 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(448): Symfony\Component\HttpKernel\HttpCache\SubRequestHandler::handle(Object(Shopware\Kernel), Object(Symfony\Component\HttpFoundation\Request), 1, true)

#8 /engine/Shopware/Components/HttpCache/AppCache.php(268): Symfony\Component\HttpKernel\HttpCache\HttpCache->forward(Object(Symfony\Component\HttpFoundation\Request), true, NULL)

#9 /vendor/symfony/http-kernel/HttpCache/HttpCache.php(238): Shopware\Components\HttpCache\AppCache->forward(Object(Symfony\Component\HttpFoundation\Request), true)

#10 /engine/Shopware/Components/HttpCache/AppCache.php(105): Symfony\Component\HttpKernel\HttpCache\HttpCache->pass(Object(Symfony\Component\HttpFoundation\Request), true)

#11 /var/www/clients/client1/web4/web/shopware.php(122): Shopware\Components\HttpCache\AppCache->handle(Object(Symfony\Component\HttpFoundation\Request))

#12 {main}