PHP error has me stumped

I have this error showing up on the bottom of my page:

Notice: Uninitialized string offset: 0 in /home/content/90/5154190/html/GGiVA/templates/gk_sporter/lib/gk.framework.php on line 600

I have debug off and it looks like it's actually showing up below the debug position in the template.

I don't see anything specifically wrong with the template but I really don't want an error message at the bottom of the site.

I don't have a clue what this means or how to correct it.

Anyone have an idea?

Thanks,

Mike Rau