"Database is locked", possibly related to multiple instances

[TomArrow]

Describe the bug
After "matches found" progress, before showing results, this error appears in an error window:

Version: 4.3.1
Python: 3.8.13
Operating System: Windows-10-10.0.19045-SP0

Traceback (most recent call last):
  File "hscommon\gui\progress_window.py", line 111, in pulse
  File "core\app.py", line 300, in _job_completed
  File "core\fs.py", line 176, in commit
sqlite3.OperationalError: database is locked

To Reproduce
Steps to reproduce the behavior:
Not sure exactly but what I did:

1. Open dupeguru. Multiple reference folders, multiple normal folders. Start analysis.
2. Open second instance of dupeguru. Have local reference folder and normal folders on network. Start analysis.
3. Analysis of the first instance is done and the error appears. Second keeps running. The first instance still shows the window with the folders but no results.

Expected behavior
Show the results.

Screenshots
If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

• OS: Win 10 Pro
• Version 4.3.1

Additional context
Add any other context about the problem here. You may include the debug log although it is normally best to attach it as a file.

Version: 4.3.1
Python: 3.8.13
Operating System: Windows-10-10.0.19045-SP0

Traceback (most recent call last):
  File "hscommon\gui\progress_window.py", line 111, in pulse
  File "core\app.py", line 300, in _job_completed
  File "core\fs.py", line 176, in commit
sqlite3.OperationalError: database is locked