Put it in your theme’s functions.php.

Whenever your visiot will try to add a product twice mistakenly, it will keep only 1 of this product in his cart.

However, he will be still able to change the quantity of the single product he has in cart.

// disable double add to cart of a product
add_filter('woocommerce_add_to_cart_validation', 'my_validation_handler', 10, 2);
function my_validation_handler($is_valid, $product_id) {
    foreach(WC()->cart->get_cart() as $cart_item_key => $values) {
        if ($values['data']->id == $product_id) {
            return false;
        }
    }
    return $is_valid;
}

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