This is not a user-fixable problem. It’s a bug, probably in one of the plugins you have installed.
Check to make sure you have the latest versions of plugins from YourHead and Foreground. If you have LogHound plugins installed you’ll have to update manually. See here: LogHound plugins Moved to YourHead
If that doesn’t help, try removing your plugins one at a time until the problem goes away. When you find out which plugin is the culprit, contact the developer (OK, it’s probably me – 
Hi, I make a lot of plugins) and share a copy of the project file with them (me). You’ll probably need to zip the project up and share it on dropbox. You can find the links to our support email at the bottom of every page of the yourhead.com site. On the off chance that it is one of the other developers, contact those guys, they may alredy be working on a fix.
Let me know what you find out,
Isaiah