PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791609597',
];

$_COOKIE = [
    '_csrf' => 'f4e7df17489e76c8fdd76a17948743387d641f1f9583654fb5d3ea1b4c550f5ca:2:{i:0;s:5:"_csrf";i:1;s:32:"WyCyl31tCHdigpuaA3jLcvdYRAaLgP1I";}',
    'topics-session' => '1791990659.362.16901.786187|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => 'uhf2npvseg60of19a9sql2okm2',
];

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