PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791079503',
];

$_COOKIE = [
    '_csrf' => 'bb69f9360e46fb495e1268c54d377885b1aa396d17ee038a1d9f4530ef7d7dd1a:2:{i:0;s:5:"_csrf";i:1;s:32:"37uT8a6y8MB4XKPqh4us32BkekoQf_Or";}',
    'topics-session' => '1791254309.926.17008.178719|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '7agmulruv3og2ug64t8dqe6ph1',
];

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