Demo not working

I got an error in the console

> 
> Uncaught TypeError: Cannot read property 'room_id' of undefined
>     at matrix-blog.js:22
>     at browser-matrix-0.5.2.min.js:3
>     at Object.callback (browser-matrix-0.5.2.min.js:3)
>     at i (browser-matrix-0.5.2.min.js:7)
>     at XMLHttpRequest.r (browser-matrix-0.5.2.min.js:7)