PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791568251',
];

$_COOKIE = [
    'topics-session' => '1792026737.548.16901.507836|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'jaej2o6p6e3gtumk3287rksvi6',
    '_csrf' => 'ee303162e3e68e41b74658a2255ea428143ee72128ae7cdd43acb632c12c8b67a:2:{i:0;s:5:"_csrf";i:1;s:32:"vQE6Ynn2d0QHRkRP_jJs0rVEqVK_txfI";}',
];

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