"Show preferences" crashes MS when no sequencer present

I imagine this is linked to the message I get when starting up MS, "no audio driver found".
Whilst that's clearly a fault with my machine, and definitely not good, MS crashing when I try to display preferences is a little excessive, I'd'a thought.

I tracked it to line 817 in preferences.cpp.
Changing this line from

if (seq->isRunning()) {
to
if (seq != nullptr && seq->isRunning()) {

seems to fix the problem.