Ripcord was crashing for me seemingly randomly when I noticed that the plug on my keyboard was loose, and that sometimes (not always, but most of the time), on unplugging, it would cause Ripcord to close/crash.

Ripcord has to be focused for this to happen. The stderr only says:

The X11 connection broke: No error (code 0) X connection to :0 broken (explicit kill or server shutdown).

I don't have any code in Ripcord that deals with keyboard devices on Linux, so I think this must be some bug somewhere in the giant stack of Qt/X11/dbus stuff.