PHP Core Warning – yii\base\ErrorException

$_GET = [
    'random' => '1791496812',
];

$_COOKIE = [
    'topics-session' => '1791542755.596.16475.531985|d197bbbd1d400bd72372bc93068ad169',
    'PHPSESSID' => '61is4s4l80r56eafbdufltpq23',
    '_csrf' => 'a00b0d129589d2eed04ae6fad5dcdbc8af87304521cb336d87b8e802e56e229aa:2:{i:0;s:5:"_csrf";i:1;s:32:"z6g_SVwDNRo2Z_sq5h0x5WAqYPKBDFQ8";}',
];

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