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PHP Warningyii\base\ErrorException

Trying to access array offset on value of type bool

$_GET = [
    'category1' => 'wentylacja',
    'category2' => 'regulatory-i-czujniki',
    'category3' => 'regulatory-obrotow',
    'product' => 'stl',
    'assortment' => 'stl-5d',
];

$_SESSION = [
    '__flash' => [],
    'return_link' => '/wentylacja/regulatory-i-czujniki/regulatory-obrotow/stl/stl-5d',
];