Error Log - PHP Notice OC 3.0.2.0

Ver. OC 3.0.2.0
Themed

Error Log 2019-02-18 19:21:59 - PHP Notice: Undefined variable: product_id in system/storage/modification/catalog/controller/product/product.php on line 645

Any Idea's what I am looking for? I scanned down my list of 3000 products. products_id, just not sure what I am looking for? didn't have much luck with search or google.

Line 645 $product_info = $this->model_catalog_product->getProduct($product_id);

On the baisis that the file is in the ../modification/ folder, there is a modification that is producing the error.

Disable one at a time (remember to refresh mod cache) until you find the problem one and go talk to the person that wrote it.

Thank you, that is a start... I never considered a module... I think I know which one. I recently added.