PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791307643',
];

$_COOKIE = [
    'topics-session' => '1791356542.698.16475.651954|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'at1bvma9vc5tfkcgmm3kru6so3',
    '_csrf' => '0dd4950ecf125e612530b7323fbbb0fe272f3ecff3ad2c48bd1bbe327a2609c4a:2:{i:0;s:5:"_csrf";i:1;s:32:"chUcOATW5Y9EuU7vcrwWNZOcolUxsIM7";}',
];

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