PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791229903',
];

$_COOKIE = [
    'PHPSESSID' => 'dfprr8rl2gaclm5h98gm6egi01',
    '_csrf' => '475a0412c92a95e3525f290e0267a8673d27b68e1198af5f611e83861de860aca:2:{i:0;s:5:"_csrf";i:1;s:32:"BNZUP1_JsRBQBxk96CAGW0b46Hl4ZiBL";}',
    'topics-session' => '1791376256.871.16551.749700|d197bbbd1d400bd72372bc93068ad169',
];

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