PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791279045',
];

$_COOKIE = [
    'topics-session' => '1791361672.527.16517.940885|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'rd0e1pn4h6bql57u236u9b6j06',
    '_csrf' => 'c55412de404f3c230fafeae565a4ed9034e46654efc294e01b78608a467195faa:2:{i:0;s:5:"_csrf";i:1;s:32:"5WrUzRy-wkmVqW1L4S2BRjBoc1w-sdBg";}',
];

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