PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1790944466',
];

$_COOKIE = [
    'PHPSESSID' => '7re6pth5r36k80tgc9j7effe12',
    'topics-session' => '1791157126.685.16477.233786|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'e0978dfb78dfdf077a78f387b407567399683f045bd00eda3143fec20808e758a:2:{i:0;s:5:"_csrf";i:1;s:32:"c9zgz2W-wiTuBHDR5K97LrXCjRgsb1eI";}',
];

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