PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791004764',
];

$_COOKIE = [
    'topics-session' => '1791029929.506.16615.662063|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'v9olq5pp5f18tep1q3n2unkba0',
    '_csrf' => 'faceef0df4876518c3370478adc4c723c52fab2bcaa5a040959c0fe8613c621ca:2:{i:0;s:5:"_csrf";i:1;s:32:"jfanKOSHGkrl5cQK_edWJVwz3XQ_ZY3G";}',
];

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