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TypeError

Argument 1 passed to common\helpers\Url::product() must be of the type string, null given, called in /var/www/html/agrozilla.com/htdocs/frontend/units/ProductUnit.php on line 127

$_GET = [
    'category' => 'opryskivateli',
    'category2' => 'polevye',
    'category3' => 'samokhodnyye',
];

$_SESSION = [
    '__flash' => [],
    '_filters' => [
        'country_name' => 'country_name',
        'manufacturer_name' => 'manufacturer_name',
        'product_name' => 'product_name',
        'region_name' => 'region_name',
    ],
];