app crash when creating secret chat to an offline peer

[Roberto Mier Escandon]

Steps to reproduce:

A is Ubuntu phone with account a
B is Android(perhaps can be any, but Android in the test) phone with account b
A has Tg started and has network connection
B hasn't network connection (can have Tg started or not. It doesn't matter)

- A sends a request of a new secret chat to B
- A new secret chat status remains as "Waiting for user to get online..."
- A exits Tg app
- A starts Tg app
- B changes network connection to online
- A receives the confirmation of new secret chat creation

Expected:
- Chat is created successfully

Result:
- App crashes and if A tries to start app again, the state of the secret chat remains as "Waitiong for user to get online..."