"Group chat": App freezed after forwarding audio

*Preconditions:*
1. User must be registered
2. User must have at least 1 contact
3. User must be a member of any group chat
4. Prepare audio file in any format

*Steps to reproduce:*
1. Run *Telegram* app
2.Navigate to the prepared group chat
3. Send prepared file to the chat
4. Tap chat logo at the header
5. Tap *Shared Media* button
6. Tap *Audio* button
7. Tap *Select* button
8. Select audio file
9. Tap *Forward* button
10. Select prepared group chat
11. Tap *Send* button

*Expected result:*
1. App launched
2. Group chat opened
3. File is displayed in the chat window
4. Group chat menu opened
5. Shared media is displayed
6. Shared audio files is displayed
9. Chats list opened
11. Audio file successfully forwarded to the selected chat

*Actual result:*
The application freezes. Interface stops to response the tapping (in any place of the screen)

*Device:*
iPad Air 2 ( iOS v11.0.1 )
Telegram v.0.4.7.1