OpenLP crash when opening service

[Jonathan Corwin]

When loading my service, I now get this error. This didn't occur prior to r1896

Traceback (most recent call last):
  File "openlp\plugins\songs\lib\mediaitem.py", line 578, in serviceLoad
    song = self.openLyrics.xml_to_song(item.xml_version, True)
  File "openlp\plugins\songs\lib\xml.py", line 385, in xml_to_song
    self._process_lyrics(properties, song_xml, song)
  File "openlp\plugins\songs\lib\xml.py", line 724, in _process_lyrics
    verses[(verse_tag, verse_number, lang)] = text
  File "lxml.objectify.pyx", line 344, in lxml.objectify.ObjectifiedElement.__setitem__ (src/lxml/lxml.objectify.c:3749)
TypeError: 'tuple' object cannot be interpreted as an index

Seems to be due to "Bless the Lord oh my soul" in the attached service.