If your ZC version is indeed that old, I am surprised that it is running at all.
My suggestion is to make a full backup of your site (database and files) and then run a FULL upgrade to get it to at least ver 1.3.9h
There are many help posts and tutorials on how to do an upgrade.
(You would upgrade a COPY of the site, so you need to create this copy first).
Then, after the upgrade, you will need to do a lot of testing to see if the (upgraded) site still works. If you have add-ons, and a custom template, you may need to do some manual work on the template files and add-on files as well to bring them up to speed with 1.3.9.
It is quite a bit of work... But in truth, you MUST upgrade to at the very least, 1.3.9h.


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