Validate if product added to cart has selected variable value Woocommerce

Question

I'm wondering how to validate if user has filled the input with personalization field. So in this case i've added function:

function filter_woocommerce_add_to_cart_validation( $passed, $product_id, $quantity, $variation_id = null, $variations = null ) {   
    // Setting
    $attribute = 'pa_personalizacja';
    
    // Real product ID
    $product_id = $variation_id > 0 ? $variation_id : $product_id;
    
    // Get product
    $product = wc_get_product( $product_id );
    
    // Get the product attribute value
    $product_attribute = $product->get_attribute( $attribute );
    
    // Initialize
    $flag = false;
    
    // WC Cart
    if ( WC()->cart ) {
        // Get cart
        $cart = WC()->cart;
        
        // If cart is NOT empty
        if ( ! $cart->is_empty() ) {
            // Loop through cart items
            foreach( $cart->get_cart() as $cart_item ) {
                // Get the product attribute value
                $cart_item_attribute = $cart_item['data']->get_attribute( $attribute );
                
                // NOT equal
                if ( $cart_item_attribute == 'Personalizowany' empty( $_REQUEST['name-on-toys'] )) {
                    // Flag becomes true
                    $flag = true;
                    
                    // Break loop
                    break;  
                }
            }
        }
    }
    
    // True
    if ( $flag ) {
        // Display an error message
        wc_add_notice( __( 'Wpisz imię do personalizacji', 'woocommerce' ), 'error' );
        
        $passed = false;
    }

    return $passed;
}
add_filter( 'woocommerce_add_to_cart_validation', 'filter_woocommerce_add_to_cart_validation', 10, 5 );

I would like to display an error if user choose variation value named "Personalizowany" and if the "name-on-toys" field is empty. Second condition works, but first not - the error appears even if "Personalization" variation is not selected. How can I make it work?