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PHP Warningyii\base\ErrorException

Trying to access array offset on value of type null

$_GET = [
    'e' => 'blog',
    'i' => '733',
    'w' => 'salihova-gulsara-xasanovnaning-pedagogika-fanlari-bo-yicha-falsafa-doktori-phd-dissertatsiyasining-himoyasi-to-g-risida',
];

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