Error

PHP Fatal Erroryii\base\ErrorException

Call to a member function getChildren() on null

$_GET = [
    'angebot' => 'z%C3%A4une',
];

$_SERVER = [
    'PATH' => '/usr/local/bin:/usr/bin:/bin',
    'LD_PRELOAD' => '/usr/local/lib/h88/av.so',
    'PHP_INI_SCAN_DIR' => ':/etc/configs/users/icservi4/php/www.guenstig-aus-polen.de/',
    'HTTP_ACCEPT' => '*/*',
    'HTTP_HOST' => 'www.guenstig-aus-polen.de',
    'HTTP_USER_AGENT' => 'claudebot',
    'DOCUMENT_ROOT' => '/home/icservi4/domains//guenstig-aus-polen.de/public_html/frontend/web',
    'REMOTE_ADDR' => '54.81.58.140',
    'REMOTE_PORT' => '53334',
    'SERVER_ADDR' => '195.78.67.41',
    'SERVER_NAME' => 'www.guenstig-aus-polen.de',
    'SERVER_ADMIN' => 'webmaster@guenstig-aus-polen.de',
    'SERVER_PORT' => '443',
    'REQUEST_SCHEME' => 'https',
    'REQUEST_URI' => '/offer/view?angebot=z%25C3%25A4une',
    'REDIRECT_URL' => '/offer/view',
    'REDIRECT_QUERY_STRING' => 'angebot=z%25C3%25A4une',
    'REDIRECT_REQUEST_METHOD' => 'GET',
    'HTTPS' => 'on',
    'REDIRECT_STATUS' => '200',
    'X_SPDY' => 'HTTP2',
    'SSL_PROTOCOL' => 'TLSv1.3',
    'SSL_CIPHER' => 'TLS_AES_256_GCM_SHA384',
    'SSL_CIPHER_USEKEYSIZE' => '256',
    'SSL_CIPHER_ALGKEYSIZE' => '256',
    'SCRIPT_FILENAME' => '/home/icservi4/domains//guenstig-aus-polen.de/public_html/frontend/web/index.php',
    'QUERY_STRING' => 'angebot=z%25C3%25A4une',
    'SCRIPT_URI' => 'https://www.guenstig-aus-polen.de/offer/view',
    'SCRIPT_URL' => '/offer/view',
    'SCRIPT_NAME' => '/index.php',
    'SERVER_PROTOCOL' => 'HTTP/1.1',
    'SERVER_SOFTWARE' => 'LiteSpeed',
    'REQUEST_METHOD' => 'GET',
    'X-LSCACHE' => 'on',
    'PHP_SELF' => '/index.php',
    'REQUEST_TIME_FLOAT' => 1711717160.5885579586029052734375,
    'REQUEST_TIME' => 1711717160,
];

$_SESSION = [
    '__flash' => [],
];

$_ENV = [
    'PATH' => '/usr/local/bin:/usr/bin:/bin',
    'LD_PRELOAD' => '/usr/local/lib/h88/av.so',
    'PHP_INI_SCAN_DIR' => ':/etc/configs/users/icservi4/php/www.guenstig-aus-polen.de/',
];