PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791554547',
];

$_COOKIE = [
    'PHPSESSID' => 'guuj3o3l8skn9lro2dgqhfmft1',
    'topics-session' => '1791642089.791.16551.49982|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'fb5e616f4207c501f0c2cbc7f1b6e8a3529f1d0f3ec3e68441792040f0590292a:2:{i:0;s:5:"_csrf";i:1;s:32:"OH7oHzm7Gc9nvQ8J3ldnX7CZit7ZAfBP";}',
];

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