PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791900394',
];

$_COOKIE = [
    'topics-session' => '1791945867.068.16901.219830|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'vie045meviqs2adtp2blgfb1r2',
    '_csrf' => '2364f06bdc9e3d0f3b51daf9cf991915cff00fd42008fd943c5a511eed87d20ca:2:{i:0;s:5:"_csrf";i:1;s:32:"q6h5m4yAz5ZI4tADK_L_fuqj8b3kmNw4";}',
];

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