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Add the below functions to 3rd Party/Custom Module . If not implement/extend the functions properly .

/**
* Creates new Form key
*/
public function renewFormKey()
{
$this->setData('_form_key', Mage::helper('core')->getRandomString(16));
}

/**
* Validates Form key
*
* @param string|null $formKey
* @return bool
*/
public function validateFormKey($formKey)
{
return ($formKey === $this->getFormKey());
}
}

Thanks!