if you run it again, does it go away? I get errors every once in a while.

Typical frontend error. I still think the database updates it correctly.

That error message indicates a TCP error (communication error between your client browser and the web server).

I have seen this error a few times myself, though it is quite rare. The error can be caused by a hiccup on the web server rather than due to any problems with the game coding. Usually it only happens once, and you probably won't see that error again for several weeks or months.