Crash on leaving a channel
If there was a private chat with somebody who is a member of several channels, then leaving the second channel where they are a participant results in the crash.
1. Join a couple of channels where somebody is present.
2. Start private chat with them.
3. Leave the first channel (successfully).
4. Leave the second channel.
Second channel is left successfully.
Built with Qt 5.13.2, running with Qt 5.13.2
Running on: Gentoo/Linux x86_64 4.12.12-gentoo #1 SMP Sun Oct 1 18:31:38 EDT 2017
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