Fatal Error when redirecting customers to iDeal

[midimedianl]

Hello,

A lot of our customers are getting an error when being redirected to iDeal. This error is: 

Fatal error: Call to a member function getMethodinstance() on a non-object in

/home/........./public_html/app/code/community/Appmerce/Internetkassa/Block/Placement.php on line 73

Mostly this error happeness when customers try to make an order with MacOS/ iOS. But it also sometimes happeness with Windows.

There are 4-5 different people which don't know how to solve this problem. Does anybody here know what could be causing this error?

[theMageComp]

@midimedianl

You will not receiving the selected payment object during checkout and dut to that you are receiving this error.

[midimedianl]

I'm sorry, but i don't understand your answer. Where should we look for what is causing this error?

[theMageComp]

This is the error in your extension. You need to share the extension code to check.

[midimedianl]

Line 73 =  */

Line 76 =  return $this->_getOrder()->getPayment()->getMethodInstance()->getFormFields($this->_getOrder());

class Appmerce_Internetkassa_Block_Placement extends Mage_Core_Block_Template
{
    public function __construct()
    {
    }

    /**
     * Return checkout session
     *
     * @return Mage_Checkout_Model_Session
     */
    public function getCheckout()
    {
        return Mage::getSingleton('checkout/session');
    }

    /**
     * Return payment API model
     *
     * @return Appmerce_Internetkassa_Model_Api_Hosted
     */
    protected function getApi()
    {
        return Mage::getSingleton('internetkassa/api');
    }

    /**
     * Return order instance by lastRealOrderId
     *
     * @return Mage_Sales_Model_Order
     */
    protected function _getOrder()
    {
        if ($this->getOrder()) {
			if ($this->getOrder()->getPayment()) {
				return $this->getOrder();
			} else {
				$orderIncrementId = $this->getCheckout()->getLastRealOrderId();
				return Mage::getModel('sales/order')->loadByIncrementId($orderIncrementId);
			}
        } elseif ($orderIncrementId = $this->getCheckout()->getLastRealOrderId()) {
            return Mage::getModel('sales/order')->loadByIncrementId($orderIncrementId);
        } else {
            return null;
        }
    }

    /**
     * Return placement form fields
     *
     * @return array
     */
    public function getFormData()
    {
        return $this->_getOrder()->getPayment()->getMethodInstance()->getFormFields($this->_getOrder());
    }

    /**
     * Return gateway path from admin settings
     *
     * @return string
     */
    public function getFormAction()
    {
        return $this->_getOrder()->getPayment()->getMethodInstance()->getGatewayUrl('redirect');
    }

}