PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1790904809',
];

$_COOKIE = [
    '_csrf' => 'a7d35613039b0c79b6a37b5a4b8f3630c83613957f03e4e9ded0fd60133c1db4a:2:{i:0;s:5:"_csrf";i:1;s:32:"eIixukbhEnj3wXXLTXMu_xZC9QrQWJzj";}',
    'PHPSESSID' => 'r1hej5itbqbddlocfph8te5bt1',
    'topics-session' => '1790922135.832.16940.486354|d197bbbd1d400bd72372bc93068ad169',
];

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