Ensure chat fails gracefully

[alisaad673]

### Tasks
- [ ] Reset chat to last known good state when there is an error.
- [ ] #332
- [ ] #299

Chatted for a few minutes and it throws this error and chat stops working:

[soulofmischief]

@lalalune have you reproduced this with current build?

[soulofmischief]

I see occasional fetch fails, but the chat resumes working state for me. Still, this is a breaking bug.