GAU after Joomla Update 3.6.2

After auto updating to Joomla v3.6.2 the Frontend is complete killed. I only get the browser message "Die aufgerufene Website leitet die Anfrage so um, dass sie nie beendet werden kann." and "ERR_TOO_MANY_REDIRECTS"! After setting up my backup data and database and the manual update to Joomla v3.6.2 everything works fine until I installed the component update K2 v2.7.1. The following error appeared:

exception 'UnexpectedValueException' with message 'JTableMenu::_getNode(1, ) failed.' in /kunden/ahdesign.net/webseiten/ahdesign35/libraries/joomla/table/nested.php:1523 Stack trace: #0 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/joomla/table/nested.php(768): JTableNested->_getNode(1) #1 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/legacy/table/menu.php(251): JTableNested->store(false) #2 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/cms/installer/adapter/component.php(1287): JTableMenu->store() #3 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/cms/installer/adapter/component.php(979): JInstallerAdapterComponent->_createAdminMenuItem(Array, 1) #4 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/cms/installer/adapter/component.php(307): JInstallerAdapterComponent->_buildAdminMenus('10021') #5 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/cms/installer/adapter.php(756): JInstallerAdapterComponent->finaliseInstall() #6 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/cms/installer/installer.php(482): JInstallerAdapter->install() #7 /kunden/ahdesign.net/webseiten/ahdesign35/administrator/components/com_installer/models/install.php(187): JInstaller->install('/kunden/ahdesig...') #8 /kunden/ahdesign.net/webseiten/ahdesign35/administrator/components/com_installer/controllers/install.php(33): InstallerModelInstall->install() #9 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/legacy/controller/legacy.php(702): InstallerControllerInstall->install() #10 /kunden/ahdesign.net/webseiten/ahdesign35/administrator/components/com_installer/installer.php(19): JControllerLegacy->execute('install') #11 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/cms/component/helper.php(405): require_once('/kunden/ahdesig...') #12 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/cms/component/helper.php(380): JComponentHelper::executeComponent('/kunden/ahdesig...') #13 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/cms/application/administrator.php(98): JComponentHelper::renderComponent('com_installer') #14 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/cms/application/administrator.php(152): JApplicationAdministrator->dispatch() #15 /kunden/ahdesign.net/webseiten/ahdesign35/libraries/cms/application/cms.php(257): JApplicationAdministrator->doExecute() #16 /kunden/ahdesign.net/webseiten/ahdesign35/administrator/index.php(51): JApplicationCms->execute() #17 {main}

Warnung
Fehler bei der Erstellung des Administratormenüs (that means there is no K2 admin menu in the Joomla administration)

In the frontend I have again the error "Die aufgerufene Website leitet die Anfrage so um, dass sie nie beendet werden kann." and "ERR_TOO_MANY_REDIRECTS"!

What the hell is going on here. This is the first time in my live I have any problems with a Joomla Update!

Hi

That's the first time I see such problem as well. Unfortunately this is not the place I'll be able to help that. You need to report this to joomla developers or k2 support since it's connected with their products. All I can advice is to reinstall joomla, k2 and make sure everything is up to date. Also check if server meets new joomla requirements.