PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1790889404',
];

$_COOKIE = [
    'PHPSESSID' => 'bvq7cudv8969i79k379784nev7',
    '_csrf' => '3b93e5333c89fe21b2d32db8f9d5265d2e66dcdc8a118755c053b79fd512676fa:2:{i:0;s:5:"_csrf";i:1;s:32:"411p66ZccwxyFDHfHt9tFmm9v1xPPFZ3";}',
    'topics-session' => '1790921651.234.16855.437204|d197bbbd1d400bd72372bc93068ad169',
];

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