PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1790922223',
];

$_COOKIE = [
    'topics-session' => '1791179958.162.16479.361674|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'as3t1v02v4okopj081g1pf4h90',
    '_csrf' => 'a395194129a55c08a11dadcb5e0110f7a049cffe04d4635322a3e055cc9488b0a:2:{i:0;s:5:"_csrf";i:1;s:32:"EThJ0tNMEqlzAFndoFxyrkzxXszZZdrw";}',
];

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