Well it looks like it is time for you to upgrade your ZenCart
As you are using 1.3.9h with php v5.4.45
Zen Cart v1.3.9 series is compatible with PHP 5.2.10 thru PHP 5.3.x.
https://www.zen-cart.com/content.php...o-run-zen-cart

And this is most likely the cause of your issues