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PHP Warningyii\base\ErrorException

Trying to access array offset on value of type bool

$_GET = [
    'category1' => 'rekuperacja',
    'category2' => 'rekuperatory-domowe',
    'category3' => 'rekuperatory-plaskie',
    'product' => 'onyx-sky',
    'assortment' => 'onyx-sky-250',
];

$_SESSION = [
    '__flash' => [],
    'return_link' => '/rekuperacja/rekuperatory-domowe/rekuperatory-plaskie/onyx-sky/onyx-sky-250',
];