PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791362312',
];

$_COOKIE = [
    '_csrf' => '201e7aa75d42d59ca536777518ee69030e3d6ff8faffbe16460591fe6fdead51a:2:{i:0;s:5:"_csrf";i:1;s:32:"cAurpRwYmiwb8a89ZNNVL5_3WcoOjJHi";}',
    'PHPSESSID' => '0rqcbeje3r48hn0l2qlic902l4',
    'topics-session' => '1791372477.723.16551.828340|d197bbbd1d400bd72372bc93068ad169',
];

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