Question

Possible Duplicate:
Any reason why Mage::registry(‘current_category’) would return NULL?
Reference – What does this error mean in PHP?

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

the code:

$_category_detail=Mage::registry('current_category');
$id=$_category_detail->getParentCategory()->getId(); 

now, when the page can’t use getParentCategory() i using the following but can’t work.

 if( isset(getParentCategory()){
        $id=$_category_detail->getParentCategory()->getId();  
    }

why? thank you

Answer 1

You need to use method_exists() rather than trying to call a non-existent function:

if (method_exists($_category_detail, "getParentCategory"))