PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791201574',
];

$_COOKIE = [
    'PHPSESSID' => 'v7o2m88bf2s32pm4jigrq2fp42',
    'topics-session' => '1791436890.361.16517.691514|d197bbbd1d400bd72372bc93068ad169',
    '_csrf' => '4c3ded288164563e42ed31bf780f85f361226f21f351c929989bdfb6d7eb7c6fa:2:{i:0;s:5:"_csrf";i:1;s:32:"WL-HgLwi91Kp8R4mHBtxOHCubSF2jhrU";}',
];

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