Max participants in the room work incorrectly

Back-redirect not working when number of participants in room are more then maximum for this room.

Steps to reproduce:
1. Create room where maximum participants are 2
2. Enter to this room with two users
3. Enter third user
Expected: Showed dialog about maximum participants in room
4. Click

button
Expected state: You redirected back to rooms list
Current state: Showed 'Loading...' and nothing happens