Country Statistics showing as undefined

I’m running an old version of 1.3.5 - it used to display the country in the statistics but now it just reports unknown. Over the years I may have changed something but can’t for the life of me figure out what. Anybody have an idea what may be causing this.

You’ll be happy to know that a new version of our store is coming out very soon with all the updates bellls and whistles, just stuck with it as it is for the next month or so, would still like to get the stats working correctly.