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PHP Warningyii\base\ErrorException

Trying to access array offset on value of type bool

$_GET = [
    'category1' => 'kominek',
    'category2' => 'odprowadzenie-spalin',
    'category3' => 'rury-i-kolana-spalinowe',
    'product' => 'knsr-uni',
    'assortment' => 'knsr-uni-120',
];

$_SESSION = [
    '__flash' => [],
    'return_link' => '/kominek/odprowadzenie-spalin/rury-i-kolana-spalinowe/knsr-uni/knsr-uni-120',
];