Google Bug?

So I was doing a bit of research on the net . . .
Of course I go to google as my first choice for searching for information.
I found an interesting bug with the google search. It seems as though when I am searching for items that contain PHP it returns this result:

http://www.google.com/search?q=php&num=20&hl=en&lr=&safe=off&start=20&sa=N

I get a first page of results returned. When I click next to get my second page of results I get the above error.

So do searches with PHP in the search and see what you get. :)

Interesting. Has got to be some strange google bug. I hope they get that one fixed soon.