I would like to update the quote item additional option with my custom input value

I am trying below

event checkout_cart_update_item_complete

        public function customPriceUpdate(Varien_Event_Observer $observer) 
        $id = (int) Mage::app()->getRequest()->getParam('id');
        $item = $cart->getQuote()->getItemById($id);
        //$item= Mage::getModel('sales/quote_item')->load($id);           
        $single_price = 100;

        $width= array(
            'label'                    => 'Width',
            'option_value'             => $width,
            'value'                    => $width,
            'print_value'              => $width,
        $length= array(
            'label'                    => 'Length',
            'option_value'             => $length,
            'value'                    => $length,
            'print_value'              => $length,
        $value = array('width'=> $width, 'length' => $length);
        $value = serialize($value);
        $item->addOption(array('code'=> 'additional_options', 'product_id'=> $item->getProductId(), 'value'=> $value));     

        //for updating the totals
        $quote = Mage::getModel('checkout/session')->getQuote(); 


When first time edit cart item its gives error Integrity constraint violation: 1452 Cannot add or update a child row: a foreign key constraint fails sales_flat_quote_item_option

Second time same code working without error.

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