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PHP Noticeyii\base\ErrorException

Trying to access array offset on value of type null

$_SESSION = [
    '__flash' => [],
    'refer' => 'www.javaheribina.com/%D8%AA%D8%B3%D8%A8%DB%8C%D8%AD/%D9%83%D9%87%D8%B1%D8%A8%D8%A7/%D8%AA%D8%B3%D8%A8%DB%8C%D8%AD-%D9%83%D9%87%D8%B1%D8%A8%D8%A7-%D9%BE%D9%88%D8%AF%D8%B1%DB%8C-%D8%B7%D8%B1%D8%AD-%D8%B4%DB%8C%D8%B4%D9%87-%D8%A7%DB%8C',
];