Thanks for the heads up!
It looks like this is happening when it's trying to find the image banner for a particular game when one doesn't exist. I'll add this to the bug list I'm building and see if I can't figure out what's going on with it. If you can determine the appid of the game that's failing (based on the badges page and your sorting options) you could try to add that game to your blacklist for now and that should fix the issue.