Social Tab missing

In my Theme Options, I only have Main, Action Button, Typography, Header, Footer, and Other. For some reason when I logged in this morning, the Social tab was no longer there. How can I get that back?

You can check your server for error log to see what have failed but personally I would just reinstall theme by removing it and installing it again. No changes done vita Theme Options will be lost, so no harm will be done. If this is not the case try to disable completely add plugin and then enable it one by one to see which one causes this issue.