I got the below error: 

sqlalchemy.exc.OperationalError: (raised as a result of Query-invoked autoflush; consider using a session.no_autoflush block if this flush is occurring prematurely)       
(sqlite3.OperationalError) database is locked

That happens when my last session did not end sucessfully, I closed all the page and create a new session. Is the reason that cause the error?  Can I just leave it alone, or must fix it?