Warning: Undefined array key "HTTP_X_FORWARDED_HOST" in /home/httpd/vhosts/snf.ch/profil.snf.ch/index.php on line 20

Fatal error: Uncaught Error: Call to a member function isPackageActive() on null in /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php:138
Stack trace:
#0 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Utility/GeneralUtility.php(3196): TYPO3\CMS\Core\Utility\ExtensionManagementUtility::isLoaded('core')
#1 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Imaging/IconProvider/SvgIconProvider.php(54): TYPO3\CMS\Core\Utility\GeneralUtility::getFileAbsFileName('')
#2 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Imaging/IconProvider/SvgIconProvider.php(35): TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider->generateMarkup(Object(TYPO3\CMS\Core\Imaging\Icon), Array)
#3 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Imaging/IconFactory.php(98): TYPO3\CMS\Core\Imaging\IconProvider\SvgIconProvider->prepareIconMarkup(Object(TYPO3\CMS\Core\Imaging\Icon), Array)
#4 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/TimeTracker/TimeTracker.php(220): TYPO3\CMS\Core\Imaging\IconFactory->getIcon('actions-documen...', 'small')
#5 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Error/ErrorHandler.php(156): TYPO3\CMS\Core\TimeTracker\TimeTracker->setTSlogMessage('Core: Error han...', 1)
#6 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/vendor/composer/ClassLoader.php(478): TYPO3\CMS\Core\Error\ErrorHandler->handleError(8192, 'Optional parame...', '/home/httpd/vho...', 98)
#7 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/vendor/composer/ClassLoader.php(478): include('/home/httpd/vho...')
#8 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/vendor/composer/ClassLoader.php(346): Composer\Autoload\includeFile('/home/httpd/vho...')
#9 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/vendor/typo3/class-alias-loader/src/ClassAliasLoader.php(135): Composer\Autoload\ClassLoader->loadClass('TYPO3\\CMS\\Core\\...')
#10 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/vendor/typo3/class-alias-loader/src/ClassAliasLoader.php(123): TYPO3\ClassAliasLoader\ClassAliasLoader->loadClass('TYPO3\\CMS\\Core\\...')
#11 [internal function]: TYPO3\ClassAliasLoader\ClassAliasLoader->loadClassWithAlias('TYPO3\\CMS\\Core\\...')
#12 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Utility/GeneralUtility.php(3711): class_exists('TYPO3\\CMS\\Core\\...')
#13 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Utility/GeneralUtility.php(3676): TYPO3\CMS\Core\Utility\GeneralUtility::getClassName('TYPO3\\CMS\\Core\\...')
#14 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Log/Logger.php(211): TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('TYPO3\\CMS\\Core\\...', 'TYPO3.CMS.Core....', 2, 'Core: Exception...', Array, 'd63f0bf0d1165')
#15 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Log/Logger.php(285): TYPO3\CMS\Core\Log\Logger->log(2, 'Core: Exception...', Array)
#16 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Error/AbstractExceptionHandler.php(79): TYPO3\CMS\Core\Log\Logger->critical('Core: Exception...', Array)
#17 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Error/DebugExceptionHandler.php(41): TYPO3\CMS\Core\Error\AbstractExceptionHandler->writeLogEntries(Object(Error), 'WEB')
#18 /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Error/AbstractExceptionHandler.php(50): TYPO3\CMS\Core\Error\DebugExceptionHandler->echoExceptionWeb(Object(Error))
#19 [internal function]: TYPO3\CMS\Core\Error\AbstractExceptionHandler->handleException(Object(Error))
#20 {main}
  thrown in /home/httpd/vhosts/snf.ch/typo3_src-9.5.26/typo3/sysext/core/Classes/Utility/ExtensionManagementUtility.php on line 138