After running GNOME 3.28 for a while, I’ve had several crashes.  It used
to crash whenever I opened a URL from Emacs, but fiddling with dconf has
fixed that.  It currently crashes every time I run ERC (I’ve turned on
notifications there), and I can’t seem to fix it.

Interestingly, there is a discussion about this on the Arch Linux forums
<https://bbs.archlinux.org/viewtopic.php?pid=1778640>.  I’m not sure if
there’s anything useful for us in there, though.

I did get a backtrace of the crash.