PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791306932',
];

$_COOKIE = [
    '_csrf' => '0073112e402dd55dab098cfe08883749a02d90d933b14350f0adbde64e470862a:2:{i:0;s:5:"_csrf";i:1;s:32:"R8TqHBggaDmt1wUn5pjRO1CwmpcA8VwM";}',
    'topics-session' => '1791403102.143.16697.310579|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'c8hfllsehkjvf6fftl8kn48fn6',
];

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