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PHP Noticeyii\base\ErrorException

Trying to access array offset on value of type null

$_GET = [
    'language' => 'fa',
    'id' => '24',
    'name' => 'ثبت-نام-شرکت-در-دورۀ-آموزش-کوتاه-مدت-حکمرانی-دانش-',
];

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