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PHP Warningyii\base\ErrorException

Trying to access array offset on value of type bool

$_GET = [
    'category1' => 'uzdatnianie-powietrza',
    'category2' => 'czujniki-i-sensory',
    'category3' => 'czujniki-czadu-dymu',
    'product' => 'gaztestowy-CODT400',
    'assortment' => 'codt400',
];

$_SESSION = [
    '__flash' => [],
    'return_link' => '/uzdatnianie-powietrza/czujniki-i-sensory/czujniki-czadu-dymu/gaztestowy-CODT400/codt400',
];