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[Launchpad Bug Tracker <1316979@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:~sam92/openlp/bug-1316979

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https://bugs.launchpad.net/bugs/1316979

Title:
  Crash when trying to delete a duplicated song

Status in OpenLP - Worship Presentation Software:
  In Progress
Status in OpenLP trunk series:
  In Progress

Bug description:
  Traceback (most recent call last):
    File "/home/samuel/programming/openlp/trunk/openlp/plugins/songs/lib/mediaitem.py", line 374, in on_delete_click
      delete_song(item_id, self.plugin)
    File "/home/samuel/programming/openlp/trunk/openlp/plugins/songs/lib/__init__.py", line 551, in delete_song
      song_plugin.manager.delete_object(Song, song_id)
    File "/home/samuel/programming/openlp/trunk/openlp/core/lib/db.py", line 372, in delete_object
      self.session.commit()
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/scoping.py", line 149, in do
      return getattr(self.registry(), name)(*args, **kwargs)
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/session.py", line 765, in commit
      self.transaction.commit()
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/session.py", line 370, in commit
      self._prepare_impl()
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/session.py", line 350, in _prepare_impl
      self.session.flush()
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/session.py", line 1879, in flush
      self._flush(objects)
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/session.py", line 1997, in _flush
      transaction.rollback(_capture_exception=True)
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/util/langhelpers.py", line 57, in __exit__
      compat.reraise(exc_type, exc_value, exc_tb)
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/util/compat.py", line 168, in reraise
      raise value
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/session.py", line 1961, in _flush
      flush_context.execute()
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/unitofwork.py", line 370, in execute
      rec.execute(self)
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/unitofwork.py", line 477, in execute
      self.dependency_processor.process_deletes(uow, states)
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/dependency.py", line 1016, in process_deletes
      secondary_update, secondary_delete)
    File "/usr/local/lib/python3.4/dist-packages/sqlalchemy/orm/dependency.py", line 1104, in _run_crud
      result.rowcount)
  sqlalchemy.orm.exc.StaleDataError: DELETE statement on table 'authors_songs' expected to delete 4 row(s); Only 5 were matched.

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