Initial connection on TestNet fails

Here is the message I encounter at 100%:

    Task exception was never retrieved
future: <Task finished coro=<ConnectionConfigController.process() done, defined at sakia/gui/dialogs/connection_cfg/controller.py:103> exception=AttributeError("'SourcesProcessor' object has no attribute '_logger'",)>
    ----
    Traceback (most recent call last):
      File "sakia/data/processors/sources.py", line 29, in commit
    File "sakia/data/repositories/sources.py", line 20, in insert
    sqlite3.IntegrityError: UNIQUE constraint failed: sources.currency, sources.pubkey, sources.identifier, sources.noffset
  
During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "asyncio/tasks.py", line 239, in _step
    File "sakia/gui/dialogs/connection_cfg/controller.py", line 182, in process
    File "sakia/gui/dialogs/connection_cfg/model.py", line 70, in initialize_sources
    File "sakia/data/processors/sources.py", line 50, in initialize_sources
    File "sakia/data/processors/sources.py", line 31, in commit
    AttributeError: 'SourcesProcessor' object has no attribute '_logger'

Note: I can click on "OK" and close the window, which opens the Home window of Sakia like we would expect if no error occurred.