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PHP Fatal Erroryii\base\ErrorException

Call to a member function getRequestFileUrl() on null

$_GET = [
    'section' => 'prom-bez',
    'type' => 'tr-pb',
    'subsection' => 'а-1',
];

$_SESSION = [
    '__flash' => [],
    '__returnUrl' => '/courses/prom-bez/tr-pb/%D0%B0-1',
];