SQLite error: database is locked

I am using HLS on a large project with VSCode, and I am being spammed with the following the error:

Error condition, please check your setup and/or the issue tracker:
HieDb writer thread SQLite error:
SQLite3 returned ErrorBusy while attempting to perform step: database is locked

I've tried restarting HLS and destroying any stack cache (didn't really expect that one to work!). Happy to provide anything else if there's not enough to go on here. I am thinking there's a manual way to clear the lock, but I don't know what that is!