PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791609680',
];

$_COOKIE = [
    'PHPSESSID' => '9ndgljl37c1kn8mq1og6uisuq2',
    '_csrf' => 'a6b11e609f3569741fe6bf69dd3b8c5c35a7c72d3d87887b1577e1246377428ea:2:{i:0;s:5:"_csrf";i:1;s:32:"oX9ipAsEKm2kJVdZxYc53niGCj9NAc0U";}',
    'topics-session' => '1791757957.649.16476.425171|d197bbbd1d400bd72372bc93068ad169',
];

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