PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791652138',
];

$_COOKIE = [
    'topics-session' => '1791845620.9.17009.110594|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '2vknb2cl9nuher8gfg3pvb0lr3',
    '_csrf' => 'c8bf1aa891c38f8fbb517dd6d88705027e82220d7a68c8acf44b0eae5a5f30f6a:2:{i:0;s:5:"_csrf";i:1;s:32:"97ebcZXDoU_w3LuM8kndO1HgpeuJ9TfF";}',
];

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