PHP Core Warning – yii\base\ErrorException

$_GET = [
    'S' => [
        'search' => 'рюкзак',
    ],
    'page' => '37',
];

$_COOKIE = [
    '_csrf' => 'f082f0791bfecb97528a600ff19fd7576bbc72740e47b06ba26e2231886dea38a:2:{i:0;s:5:"_csrf";i:1;s:32:"5R2fDGMQadYKqqqMUJI4Vat5JSareSGi";}',
    'PHPSESSID' => 'tl2s0ngh50fv20351e3i3hu8og',
];

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