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PHP Warningyii\base\ErrorException

Trying to access array offset on value of type bool

$_GET = [
    'category1' => 'okapy-kuchenne',
    'category2' => 'okapy-kuchenne-przyscienne',
    'product' => 'stone',
    'assortment' => 'stone-33',
];

$_SESSION = [
    '__flash' => [],
    'return_link' => '/okapy-kuchenne/okapy-kuchenne-przyscienne/stone/stone-33',
];