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PHP Warningyii\base\ErrorException

Trying to access array offset on value of type bool

$_GET = [
    'category1' => 'okapy-kuchenne',
    'category2' => 'okapy-kuchenne-kominowe',
    'product' => 'ok2-turbo',
    'assortment' => 'ok-2-turbo-bialy-60cm',
];

$_SESSION = [
    '__flash' => [],
    'return_link' => '/okapy-kuchenne/okapy-kuchenne-kominowe/ok2-turbo/ok-2-turbo-bialy-60cm',
];