For v1.3.7 ... this is a good patch to add in to ensure all is set right ...

http://www.zen-cart.com/forum/showthread.php?t=56216

As to is there an issue on your site due to the code ... well questions are:

1 Is this a clean v1.3.7 or an upgrade ...

2 if an upgrade, from what version and how ...

3 has this ever worked right? what about in all your testing before you went live?

4 any changes on your server? such as new php version, moving hosts, etc.