While investigating a crash in the thread below, we found that this script was the trigger. It most likely only happens if it's configured in a certain way. Jon suggests a 1 line change which should prevent the crash:
We'll also be changing Opus so that future versions won't crash with this kind of thing. (Scripts shouldn't be able to crash the program, at least not just by setting something to null.) But it might be worth updating the script as well, for current/previous versions (Opus 11 users in particular).