I was also facing this problem in magento when I was creating new api user for web service. We need to override function getRowUrl in app\code\core\Mage\Adminhtml\Block\Widget\Grid.php.
- * Return row url for js event handlers
- * @param Mage_Catalog_Model_Product|Varien_Object
- * @return string
- public function getRowUrl($item)
- $res = parent::getRowUrl($item);
- return ($res ? $res : ‘#’);