Fatal error: Unknown: Cannot use output buffering in output buffering display ha

I’m getting an error on blank white page

Fatal error: Unknown: Cannot use output buffering in output buffering display handlers in Unknown on line 0

on some of my pages at http://www.geekdashboard.com
and here is one example
http://www.geekdashboard.com/google-chrome-has-stopped-working/

It is happening rarely and can’t figure out why

Any help is highly appreciated