WordPress database error – Help!

My site – http://www.thechocolatereview.net/ – uses the latest version of WordPress, I was just trying to sort out my widgets when I realised that I couldn’t move any of them, it instead just selected the text like I was going to copy and paste, I then just clicked “Save Changes” anyway for some stupid reason, and it’s reset all my widgets to the default layout and I can’t put any of them back.

I also have this message at the bottom of my sidebar – “WordPress database error: [You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ” at line 1]”

I have no idea what this means or what to do, and I’m the least tech-savvy person around. Is anyone able to help?