PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1790899125',
];

$_COOKIE = [
    'PHPSESSID' => 'n2vrsoufhsq7e2ulcjs251u4j5',
    'topics-session' => '1790997550.508.16481.910245|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => 'e0c55ceb4fbc3039c97ec2d271c6ae56ec234cb68c9ce69fc4a3fa2a3dc350caa:2:{i:0;s:5:"_csrf";i:1;s:32:"ZNb73IyZOmAm6JWF5yHoNozoqPmZ-rju";}',
];

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