Often error in error errors

[ErinNoble]

I found this error often in my error, how did I get this?

[Apr 18 00:49:11 2015] [Customer] 188.165.15.227] Mod_FKGid: STARR: Note PHP: Optional: Tabletections :: $ Category_parent_id in * domains / twr-trading.nl/public_html/components / com_virtuemart / views / category / view.html.php on page 162

[GJC Web Design]

 its just a notice  but did u copy/paste this?  it makes very little sense

the only instance of Category_parent_id in that file is line 662

maybe it needs

if ($cat and !empty($cat->category_parent_id) and $this->categoryId != $cat->category_parent_id) {

to

if ($cat and isset($cat->category_parent_id) and !empty($cat->category_parent_id) and $this->categoryId != $cat->category_parent_id) {

or similar