Inifnite loop node/add/product

Hi, i just want to know if anybody experienced an inifinte loop when adding a product into a database. When I try to add a product the page stops loading and stays blank. With no error. I have checked the code and I discoverd that when _product_form is called than at the end of the function in this line
line:284 $form['product'] = array_merge($form['product'], (array) product_invoke_productapi($node, 'form'));
which invokes the API hooks and it calls the _product_form hook again. When I comment this line everything seems to work fine ..but just seems. Because the product is not added into the DB.

Anyone experienced something like this?

THNX. Olliwe.