You can get stuck in building, what is located in Guba.

Seems like that building has one extra stairs to floor what does not exist. It does have a door in front of the invisible stairs, but somehow I glitched trough it.

I got stuck there for 10 minutes. Until I figured out that I could jump over the "hand railing" what is invisible (looks like wall from the other side).

Screenshots: http://imgur.com/a/VHL8t

1st. image shows the particular building.
2nd. image shows the upper floor where I got stuck. That is the door I got trough, or I got trough it from just next to it into the stairs.