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PHP Warningyii\base\ErrorException

Trying to access array offset on value of type bool

$_GET = [
    'category1' => 'ogrzewanie',
    'category2' => 'promienniki',
    'category3' => 'promienniki-podczerwieni',
    'product' => 'hall',
    'assortment' => 'hall-3000',
];

$_SESSION = [
    '__flash' => [],
    'return_link' => '/ogrzewanie/promienniki/promienniki-podczerwieni/hall/hall-3000',
];