PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791245187',
];

$_COOKIE = [
    '_csrf' => 'b1bc81b154b0c661fafd7f0b53e5a6ece25e42d01af53d38282a7b0772ebeafca:2:{i:0;s:5:"_csrf";i:1;s:32:"0NSR56dpzQMc7M7BP6i5h15_c8XtaBRF";}',
    'topics-session' => '1791272493.853.16855.562580|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'dd58aj2hkvbbdedfbk6jh1tbh0',
];

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