Answer by Dennis Golomazov for Getting error when trying to open a feed dialog

I had the same problem. I was trying to open a Feed dialog automatically after page load. And 9 times of 10 it displayed this error. The code was in $(document).ready jQuery function. And it seems that some facebook stuff had not yet been loaded at the point the code was to be executed. I moved the code to $(window).load block (which is executed after all page content is loaded), and the problem has been solved.