PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791098696',
];

$_COOKIE = [
    'PHPSESSID' => 'ltnvvgcv8c7e6hmaq7ug4qkaq2',
    '_csrf' => '1ce5aec558f979987a18c31579276de3d9201299cb0c0a1a912c3ca28798a0eea:2:{i:0;s:5:"_csrf";i:1;s:32:"JozcKlJszVes5C8nTXVDU27BTNDTsuOG";}',
    'topics-session' => '1791192830.527.16475.437617|d197bbbd1d400bd72372bc93068ad169',
];

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