Returning to client with a bugsplat?

Have had it happen several times where I've been afk for hours (in client..not game -.-) and when I return I have a bugsplat on my screen. Client is still open and as far as I can tell I haven't even been dc'd from chat. (Cause clubs haven't popped back to chat, unless they fixed that?)

Have only noticed this after 7.13.

Anyone else have a clue what's up with this/having it happen too? Kinda hard to isolate to something happening on client, as I'm not there to watch it/haven't had it happen yet while I'm actually at my computer.