Transactions & Orphan MySQL connections

[eluser]Unknown[/eluser]
hy!
I turned the pconnect off. It works, when for example:
$this->db->trans_start();
delete_customer($id);
non_exist_function(); // fatal error
$this->db->trans_complete();

The querys in the delete_customer will be rollback. Ok.
But, when a php notice is throwed, for example:
Notice: Trying to get property of non-object....
anywhere in the delete_customer function, the rollback will not happen... any idea?
Thanks.