PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791074690',
];

$_COOKIE = [
    'PHPSESSID' => '1j7vjgh9sa1p5qd7saagl1t2b1',
    'topics-session' => '1791187725.233.16697.815344|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'c4916e0d1499bcb046bfd08976d6e649402b6ae552973fca5d432266cb5ed980a:2:{i:0;s:5:"_csrf";i:1;s:32:"x7f06cBJdWQ7gUHHlro1k62SC-XP5Maj";}',
];

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