nonfatal traceback ValueError: incomplete format

[Ian]

Traceback (most recent call last):
  File "/usr/bin/pithos", line 517, in on_message
    self.update_song_row()
  File "/usr/bin/pithos", line 563, in update_song_row
    self.songs_model[song.index][1] = self.song_text(song)
  File "/usr/bin/pithos", line 534, in song_text
    dur_str = self.format_time(dur_int)
  File "/usr/bin/pithos", line 581, in format_time
    return "%i:%02i:%021"%(h,m,s)
ValueError: incomplete format