Infinite Timed Practice Bug

[S0R0USH]

So this happened, and I hope you fix this bug:
http://i.imgur.com/s1BMWBb.png

I don't know how to reproduce this bug, but I think I was pressing enter really fast to skip hard questions.

[kristinemc]

Hi there! We're aware of this bug. :)

[TimothyGeek]

That's been around for as long as I can remember, but it hasn't happened to me in a while. :(

[duolingoje]

That had happened to me a week ago! I hope they fixed it!