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Error

Call to a member function findValueById() on null

$_GET = [
    'p' => '21%2C104%2C106%2C14-23',
];

$_SESSION = [
    '__flash' => [],
    'tmp' => '/?p=21%252C104%252C106%252C14-23',
    'H0' => '/?p=21%252C104%252C106%252C14-23',
    'H1' => null,
    'H2' => null,
    'H3' => null,
    'H4' => null,
    'H5' => null,
    'H6' => null,
    'H7' => null,
    'H8' => null,
    'H9' => null,
];