Does not produce valid mbtile

On Linux Mint with QGIS 3.8, the process starts, the progress bar goes to 100%, the mbtile is written, but the journal file is still there.
In the QGIS log, I see this error:

2019-07-11T12:40:06 WARNING Traceback (most recent call last):
File "/home/bernd/.local/share/QGIS/QGIS3/profiles/default/python/plugins/QMetaTiles/tilingthread.py", line 131, in run
tileset.writer.finalize()
File "/home/bernd/.local/share/QGIS/QGIS3/profiles/default/python/plugins/QMetaTiles/writers.py", line 107, in finalize
optimize_database(self.connection)
File "/home/bernd/.local/share/QGIS/QGIS3/profiles/default/python/plugins/QMetaTiles/mbutils.py", line 69, in optimize_database
cur.execute("""VACUUM;""")
sqlite3.OperationalError: cannot VACUUM from within a transaction

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